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Axis of Symmetry : THe line that divides the figure into two identical parts is called Axis of Symmetry. This cookie is set by GDPR Cookie Consent plugin. Do you know anyone else who would enjoy this? I, OHO, and IHI'IHI are the only words in the English language that, when written in upper case letters, have horizontal and vertical symmetry and consist entirely of letters that have both . Line symmetry is usually named by the line where you would put a mirror, showing how the two sides of the shape are reflections of each other. Most of these leaves depict symmetric patterns if we take the middle vein as the line of vertical symmetry. You can also use a ruler to draw a straight line through the center of a shape (horizontally or vertically) and observe both sides to determine if there are identical traits. Select the Layout tab and then click the arrow next to Vertical Alignment in the Page section. (ha! In this activity, students look for symmetry in letters of the alphabet. The first figure below shows that the letter A has a vertical line of symmetry, but its rather tame play. They depict the colorful science of symmetry. This cookie is set by GDPR Cookie Consent plugin. Well before children begin any formal study of symmetry, playing with mirrors perhaps on Pattern Block designs that they build develops experience and intuition that can serve both their geometric thinking and their artistic ideas. If the sides match up, you can identify that the shape has a line of symmetry; if they dont, you can determine that the shape is asymmetrical. Some Points to Remember. Vertical Line of Symmetry. B. a translation down and a reflection over the, There is also a diagram drawn on my homework which is a vertical, An image shows a two dimensional arrow with a dashed line drawn down the middle of the arrow. The concept of symmetry is commonly found in geometry. 2 comments ( 10 votes) Upvote Downvote Flag more Show more. What is the formula for calculating solute potential? The words horizontal and vertical are generally used in a planar (2-dimensional) sense, not spatial (3-dimensional). It may be horizontal, vertical, or diagonal. The most frequently looked up article in the World Book Encyclopedia is said to be SNAKE. Because I'm pretty sure that if you fold HI over on itself it won't be symmetrical vertically. The longest such word, with ten letters, is OKEECHOBEE. 1 LoSOne Line of Symmetry Vertical lines of symmetry Horizontal lines of symmetry Diagonal lines of symmetry 6. Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. You can ask a new question or browse more Math questions. 1) A single plane of reflection symmetry. Are there any words that are vertically symmetrical? It does not store any personal data. 2 Whats a word that has a line of symmetry? RELATED: How to Align Text After a Bullet in PowerPoint. For example, the image below shows a horizontal line of symmetry. Press ESC to cancel. To see any real difference, try enabling the horizontal text option before inputting the text in your document. 4) Five planes of reflection symmetry. Math mastery comes with practice and understanding the Why behind the What. Experience the Cuemath difference. What is a horizontal line of symmetry? The horizontal line of symmetry divides a shape into identical halves, when split horizontally, i.e., cut from right to left or vice-versa. Horizontal Line of Symmetry. When the figure is folded about this line the two parts fir exactly over each other. How does violence against the family pet affect the family? In 2001, the ten most frequently looked up words in the Cambridge Dictionaries Online were SERENDIPITY, IDIOM, PARADIGM, UBIQUITOUS, DICTIONARY, PRAGMATIC, EFFECT, GRY, JINGOISM, and FOIBLE. Draw an imaginary vertical line at the center of your composition. When an object is rotated in a particular direction, around a point, then it is known as rotational symmetry, also known as radial symmetry. I the H's line in the middle will go on top of I. For example, we can split the following square shape across the corners to form two identical halves. Statement 3: All letters have horizontal line of symmetry. (b) The following letters have horizontal lines of symmetry: B, C, D, E, H, I, K, O, and X. Necessary cookies are absolutely essential for the website to function properly. These explanations are written by Lido teacher so that you easily understand even the most difficult concepts. Reflexive symmetry: Reflective symmetry, also called mirror symmetry, is a type of symmetry where one half of the object reflects the other half of the object. In a symmetrical shape, one-half is the mirror image of the other half. (1 point) yes no 2. The longest such word, with ten letters, is OKEECHOBEE. Vertical lines are defined as the lines parallel to Y-axis. The words most likely to be misspelled (ratio of incorrect to correct spelling) according to a study of Usenet traffic some years ago were DUMBELL, OCCURRENCE, MEMENTO, FRUSTUM, COLLECTIBLE, AMATEUR, DAIQUIRI, PASTIME, ACCIDENTALLY, PLAYWRIGHT, EMBARRASS, ACQUIT, HARASS, and PRONUNCIATION. These objects might have one, two, or multiple lines of symmetry. The cookie is used to store the user consent for the cookies in the category "Other. Draw a line from the bottom. Unfortunately, neither is HIGGLEHAGGLED nor GIBBLEGABBLED, also 13 letters each. However, you may visit "Cookie Settings" to provide a controlled consent. Letters with rotational symmetry are those which, when rotated 180 degrees around their centers, resemble their original forms at any point throughout the rotation. On this note, some letters keep their lines of symmetry even when made lowercase, no matter the font. Generally, you should not handle the cases separately. Then draw each letter showing the lines of symmetry. This line may also be called a sleeping straight line that parts an image or shape into identical halves. 3 Has the letter T got a vertical or horizontal line of symmetry? This tool also allows you to be selective with the text you align horizontally, giving you more control over what you can do to your document. Some other words frequently looked up, besides obscene words, were UBIQUITOUS, ESOTERIC, OXYMORON, SERENDIPITY, HUBRIS, OBSEQUIOUS, and ECLECTIC. Lots of buildings and everyday objects use symmetry because it looks appealing to the human eye. RELATED: How to Change the Alignment of the Numbers in a Numbered List in Microsoft Word. The two concepts have nothing to do with one other. Symmetry is a common occurrence in many areas of mathematics and hence is studied using every aspect of similarity and identity. CHECKBOOK, provided it is written in upper case letters, is the longest word in the English language with a line of horizontal symmetry. The vertical line is perpendicular to the horizontal line. That means the horizontal line of symmetry goes from left to right (or vice versa) in an object. Rotational symmetry exists when a shape is turned, and the shape is identical to the origin. The horizontal mirror image just begs to be balanced in terms of a perfectly straight horizontal line and enough space in the frame to show the reflection properly. Wordplay: Words with vertical symmetry AUTOMATA AUTOTOMY HIMATIA HOITY-TOITY HOMOTAXIA MAHATMA MAHIMAHI MAMMATI MAMMOTH MATAMATA MOTIVITY MOUTH-TO-MOUTH MYOMATA This means that the bottom of the letters is a reflection of the top. Horizontal, Vertical, Perpendicular, Parallel, Diagonal - 1 Week Unit of WorkThis download includes a Math unit on different types of lines, which is made up of 3 tasks. Each symmetry operation has a corresponding symmetry element, which . A line of symmetry is one that divides a figure into two halves which are mirror images of each other. Vertical and Horizontal Symmetry. In such a case, the line of symmetry is vertical. The T, U, and V are symmetrical, but they each have only one line of symmetry. Other ten-letter words with this property are PEPPERROOT, PEPPERWORT, PERPETUITY, PEWTERWORT, PIROUETTER, PREREQUIRE, PRETORTURE, PROPRIETOR, REPERTOIRE, REPETITORY, TETTERWORT. If hyphens are allowed, then TEETER-TOTTER (12 letters) is possible, as is TEETER-TOTTERER (14 letters), although the latter is not found in dictionaries. How many lines of symmetry does the, Provide a counterexample to show that each statement is false. That means the axis here crosses across the shape to cut it into two equal parts. Its all up to you. The longest words with vertical symmetry are OTTO, MAAM, and TOOT. Michelle is a designer with a focus on creating joyful digital experiences! The letters, N, Z, and S also share that property. 11 What do letters have lines of symmetry? And could you tell me what you mean when you say "printed vertically" and "printed horizontally"? More intrepid experiments give other interesting results. A diagonal line of symmetry divides a shape into identical halves when split across the diagonal corners. Similarly, for Vertical Symmetry, initialize one . Which is the reason you may not find a word corresponding to the third dimension along with horizontal and vertical. Solution These cookies ensure basic functionalities and security features of the website, anonymously. This line is horizontal________________ DRL-1741792 (Math+C), and NSF Grant No. The longest is NONSUPPORTS (11 letters), although if place names are allowed then the 13-letter words TUTTOQQORTOOQ (in Greenland) and ROSSOUWSPOORT (in South Africa) are valid. And some, like P, R, and N, have no lines of symmetry. Horizontal symmetry follows the same rules as vertical symmetry, only along a horizontal axis. Diagonal Line of Symmetry. being everywhere equidistant and not intersecting. Horizon Analogy to Understand Horizontal Line Horizon is a line along which the earth and sky seem to meet. The longest is NONSUPPORTS (11 letters), although if place names are allowed then the 13-letter words TUTTOQQORTOOQ (in Greenland) and ROSSOUWSPOORT (in South Africa) are valid. 5) Six planes of reflection symmetry. The cookie is used to store the user consent for the cookies in the category "Performance". If you drew a horizontal line across the word and folded it over, it would overlap on itself. Remember vertical means from top to. Alphabets like C, E, H, K, O, X etc can be divided into equal . when a vertical or horizontal line is made to pass through the letter, it gets divided into two equal halves. Words or letters? Which letters have horizontal lines of symmetry? And some, like P, R, and N, have no lines of symmetry. In 2001, the ten most frequently looked up words in the Cambridge Dictionaries Online were SERENDIPITY, IDIOM, PARADIGM, UBIQUITOUS, DICTIONARY, PRAGMATIC, EFFECT, GRY, JINGOISM, and FOIBLE. The word horizontal is derived from the word horizon. A shape or an object has symmetry if it can be divided into two identical pieces. Those identical parts are symmetry. Lines of symmetry appear in everyday applications. Another symmetry that children sometimes use in their Pattern Block designs is Rotational Symmetry. A figure has rotational symmetry if some rotation (other than a full 360 turn) produces the same figure. Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. English alphabets also are good examples of horizontal symmetry. For example, the diagonal of a square divides it into two equal halves, this is referred to as the line of symmetry for a square. Figures with infinite lines of symmetry are symmetrical only about two lines. We say that the original figure is symmetric with respect to the mirror; it has reflective symmetry. Symmetrical Words Some long words with horizontal symmetry are: BEDECKED, BOOHOOED, CHECKBOOK, CODEBOOK, COOKBOOK, DECIDED, DIOXIDE, DOBCHICK, EXCEEDED, HOODOOED, and KEBOBBED. Answer: The letter 'X' has both horizontal and vertical lines of symmetry,i.e. The English alphabets such as B, C, H, E, are the examples of horizontal symmetry. These are the two questions that I'm stuck on: 1. Which is a word with a point of symmetry? This type of Symmetry is called Translational Symmetry. Within mathematics, a line of symmetry indicates an invisible border that, when drawn through a shape, divides that image into identical pieces that share the same dimensions. By clicking Accept All, you consent to the use of ALL the cookies. Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features. You can use words or make a diagram. The line of symmetry can be categorized based on the basis of its orientation. In modern language though, symmetry means something that has parts which mirror each other. Jason takes a selfie with his sister. 1. This line of symmetry is called the axis of symmetry. The line of symmetry is a line that divides an object into two identical pieces. When written in upper case, the word BID has horizontal symmetry, but when written in lower case it has vertical symmetry bid! FICKLEHEADED and FIDDLEDEEDEE are the longest English words consisting only of letters in the first half of the alphabet, each being 12 letters long. By submitting your email, you agree to the Terms of Use and Privacy Policy. No, the line of symmetry cannot be parallel. Reflexive Symmetry Glide Symmetry 1.Translational Symmetry An object or image is moving forward or backward or changing the position from one place to another, but there is no change in the image or object. The following image shows how the structure of a starfish follows rotational symmetry. What is the difference between horizontal and vertical symmetry? We select and review products independently. Some letters, for example, X, H, and O, have both vertical and horizontal lines of symmetry. B, C, D, E and K have horizontal lines of symmetry. As youve probably guessed, vertical alignment positions the text evenly between the upper and lower margins of the page. The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. A line of symmetry creates two congruent figures that are mirror images of each other. Reflective Symmetry. 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With two-dimensional shapes, you can find a line of symmetry by folding the image/object until both sides of the shape are completely aligned with one another. In the alphabet, over half of all letters have lines of symmetry. Theres also an easy way to make this happen. Letters with tails or embellishments may lose their lines of symmetry, while fonts that produce uniform letters retain them. 1455 Quebec Street The definition of Symmetry in Math, states that symmetry is a mirror image, i.e., when an image looks identical to the original image after the shape is being turned or flipped, then it is called symmetry. This figure has two lines of symmetry: the horizontal line of symmetry cuts the figure into a top and bottom that are mirror images of each other the vertical A line of symmetry is one that divides a figure into two halves which are mirror images of each other. Symmetricity exists in patterns. Necessary cookies are absolutely essential for the website to function properly. He's currently an API/Software Technical Writer based in Tokyo, Japan, runs VGKAMI andITEnterpriser, and spends what little free time he has learning Japanese. 4 Which English letter has horizontal and vertical symmetry? Others include MOM, WOW, AHA, AHA, AIA, AMA, AVA, AWA, HAH, HOH, HUH, MAM, MIM, MUM, OHO, OXO, TAT, TIT, TOT, TUT, UTU, VAV, and WAW! What are horizontal and vertical lines of symmetry? And here the code from the tutorial: static void checkHV (int [] []arr, int N, int M) { // Initializing as both horizontal // and vertical symmetric. In other words, objects are the same on both sides of a line (usually in the middle). The longest such word, with ten letters, is OKEECHOBEE. In geometry, a horizontal line is one which runs from left to right across the page. Which is the vertical line of symmetry in math? This tool also allows you to be selective with the text you align horizontally, giving you more control over what you can do to your document. We can also find the line of symmetry in shapes also. . Both vertical line and horizontal line of symmetry pass through the middle of an object or alphabet or pattern to form mirror halves, which when placed on each other covers the other part. . Any rotation of any amount around the center of the circle also leaves the circle unchanged. Which is correct poinsettia or poinsettia? He worked at Synology, and most recently as CMO and technical staff writer at StorageReview. Which words have both vertical and horizontal symmetry? These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. None of these letters has two lines of symmetry. This line may also be called a sleeping straight line that parts an image or shape into identical halves. Does that help? Letters with horizontal symmetry are B, C, D and E. The letters K, F, G, J, K, L, N, P, Q, R, S and Z all do not have lines of symmetry. You can find many objects in real life that have rotational symmetry like wheels, windmills, road-signs, ceiling fans, and so on. The longest words with vertical symmetry are OTTO, MAAM, and TOOT. The only dictionary word which can be typed using only the bottom row of letters is ZZZ (to indicate sleeping). For example, when you are told to cut out a heart from a piece of paper, you simply fold the paper, draw one-half of the heart at the fold and cut it out to find that the other half exactly matches the first half. Which is more common horizontal symmetry or vertical symmetry? Example 2: Identify which of the following figures is symmetrical about the given line l? In mathematics, horizontal symmetry is less common than vertical symmetry. The famous Ferris wheel, the London Eye, is an example of rotational symmetry. Needless to say, it is relevant whether the word is written in upper or lower case. 2 has no symmetry. What is the highest-scoring Scrabble game? For example, the following shape can be split into two equal halves when cut horizontally. Most looked-up and most misspelled Words The line of symmetry is a line that divides an object into two identical pieces. In other words, a horizontal line of symmetry is that line that runs across the image thus dividing into two identical halves. Symmetry is when you split an object with a line of symmetry into two parts that are exactly similar. Now search for the letters with a vertical axis of symmetry (letters that have the sameshape on the left as on the right, like M, A and O). The shape and the matching parts must be in opposite directions. And some, like P, R, and N, have no lines of symmetry. Can you create words and sentences with vertically symmetrical letters? Both vertical line and horizontal line of symmetry pass through the middle of an object or alphabet or pattern to form mirror halves, which when placed on each other covers the other part. Word records: vowels. y=3 y= 3. y=0 y= 0. Sign up for our free web site updates here. These cookies track visitors across websites and collect information to provide customized ads. AFTERCATARACTS, TESSERADECADES and TETRASTEARATES (each 14 letters) are the longest words which can be typed using only the fingers of the left hand, using the standard method of typing. The longest such word, with ten letters, is OKEECHOBEE. From Canada, Ty was born in Vancouver, British Columbia in 1993. The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. Try to find symmetry in lowercase letters. What are the highest-scoring Scrabble words? For example, the following figure, where the shape is moved forward and backward in the same orientation by keeping the fixed axis, depicts translational symmetry. Image by Peter H from Pixabay. The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". More Word Records Capital letters (write your own with thick marker on paper or print out template) This cookie is set by GDPR Cookie Consent plugin. Use a mirror to find the letters that have a horizontal axis of symmetry (letters that havethe same shape on top as on the bottom, like E, I and O). Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. Letters that have vertical lines of symmetry include A, M, T, U, V, W and Y. For example, the diagonal of a (non-square) rectangle is not a line of symmetry. 1 Which words have both vertical and horizontal symmetry? So, there are only 5 capital English alphabets having a single and horizontal line of symmetry. Now, since the x-coordinate remains constant on a vertical line, therefore we have x 2 = x 1 = x. As a result, school materials tend to use the word symmetry as if it had only that one meaning. // We compare first row with last // row, second row with second // last row and so on. 8 How many alphabets have no line of symmetry? Rotational symmetry is the quality a design has if it maintains all characteristics when it is rotated about a point. A circle has infinitely many lines of symmetry: any diameter lies on a line of symmetry through the center of the circle. In standard fonts, the letters A, M, T, U, V, W and Y each have a vertical line of symmetry that divides the letter into two corresponding mirror images. The longest words with vertical symmetryare OTTO, MAAM, and TOOT. The words most likely to be misspelled (ratio of incorrect to correct spelling) according to a study of Usenet traffic some years ago were DUMBELL, OCCURRENCE, MEMENTO, FRUSTUM, COLLECTIBLE, AMATEUR, DAIQUIRI, PASTIME, ACCIDENTALLY, PLAYWRIGHT, EMBARRASS, ACQUIT, HARASS, and PRONUNCIATION. Explain that rotational symmetry, seen daily by the students when they look at flowers, domes, round grates and many other objects in their surroundings. A common misconception found even in many glossaries and texts: Not all lines that divide a figure into two congruent parts are lines of symmetry. Glide symmetry is the combination of both translation and reflection transformations. Glide symmetry: Glide symmetry is the combination of both translation and reflection transformations. Rotational symmetry Another symmetry that children sometimes use in their Pattern Block designs is "Rotational Symmetry." They are B, C, D, E, and K. Answer: The letter X has both horizontal and vertical lines of symmetry,i.e. All of the letters in the words SOONISH (7 letters) and ONIONS (6 letters) independently have 180-degree rotational symmetry. Lettters with horizontal line symmetry include: H K O E B C What are some words with these symmetry? These letters retain the image of their original form, even when flipped on their heads. Subalphabetic Words In other words, translation symmetry is defined as the sliding of an object about an axis. What makes a letter or object symmetrical? answered by Sara February 6, 2010 Here are letters that have symettry about a vertical fold O, I, M, W, T, A, H,U,V,X,Y Does that help? For example, the following shape can be split into two equal halves when cut horizontally. Symmetry : The dotted line divides the figure into two identical parts. when a vertical or horizontal line is made to pass through the letter, it gets divided into two equal halves. Symmetrical Words This cookie is set by GDPR Cookie Consent plugin. Some letters, for example, X, H, and O, have both vertical and horizontal lines of symmetry. This cookie is set by GDPR Cookie Consent plugin. The trapezoid has only the vertical line of symmetry. Therefore, it shows reflection symmetry. Don't forget there is the fourth dimension: time. when a vertical or horizontal line is made to pass through the letter, it gets divided into two equal halves. In the above pictures or figures the lines of symmetry are both horizontal and vertical. However, you may visit "Cookie Settings" to provide a controlled consent. f(x)=ax^2+bx+c ? Demonstrate how visible light is reflected. DRL-1934161 (Think Math+C), NSF Grant No. When a figure is folded in half, along its line of symmetry, both the halves match each other exactly. If you turn or rotate the starfish about point P, it will still look the same from all directions. The striking aspect of symmetry can be observed in rangoli designs. This figure has two lines of symmetry: the horizontal line of symmetry cuts the figure into a top and bottom that are mirror images of each other; the vertical line of symmetry cuts the figure into a left and right that are mirror images of each other. Hence, the alphabets which have vertical lines of symmetry are A, H, I, M, O, T, U, V, W, X and Y. Whats a word that has a line of symmetry? SHAKALSHAS (10 letters) is the longest word which can be typed using only the middle row of letters on the keyboard. Example 1: If the following figure shows a reflexive line of symmetry, complete the figure. That means the horizontal line of symmetry goes from left to right (or vice versa) in an object. By clicking Accept All, you consent to the use of ALL the cookies. H-If you fold this on top of eachother I the H's line in the middle will go on top of I. In mathematics, horizontal symmetry is less common than vertical symmetry. Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. SWIMS is probably the longest word with 180-degree rotational symmetry. Here, we have a star and we can fold it into two equal halves. Horizontal symmetry can be observed in squares, rectangles, circles and ovals, though not in stars, triangles, hearts or pentagons. We also use third-party cookies that help us analyze and understand how you use this website. has 3 Lines of Symmetry A Square (4 sides) has 4 Lines of Symmetry A Regular Pentagon (5 sides) has 5 Lines of Symmetry A Regular Hexagon (6 sides) has 6 Lines of Symmetry A Regular Heptagon (7 sides) has 7 Lines of Symmetry A Regular Octagon (8 sides) has 8 Lines of Symmetry And the pattern continues: 10 What is the definition of horizontal symmetry? Subalphabetic Words What is the highest-scoring Scrabble game? The longest such word, with ten letters, is OKEECHOBEE. Closely related to palindromes, symmetrical words are words that have an axis of symmetry, or point of rotational symmetry. His illustration work has been published in the Walrus, The National Post, Readers Digest and Chickadee Magazine. Horizontal symmetry can be observed in squares, rectangles, circles and ovals, though not in stars, triangles, hearts or pentagons. Some other words frequently looked up, besides obscene words, were UBIQUITOUS, ESOTERIC, OXYMORON, SERENDIPITY, HUBRIS, OBSEQUIOUS, and ECLECTIC. In such a case, the line of symmetry is vertical. Horizontal symmetry is a reflection across the horizontal axis. He loves to make music, ride bikes, and spend time in the forest. An object and its image are symmetrical with reference to its mirror line. As per the definition of slope, we calculate the slope this way:. Select all letters you can use to create words with horizontal symmetry like COOK A 0 B F G K L M R Q U w Z (c) With an appropriate font, the image of 1881 is 1881 after reflection in either a horizontal or vertical line, as shown in the following figure. A, H, M, O, U, V, W, T, Y are some of the alphabets that can be divided vertically in symmetry. The lines may vertical, horizontal, or diagonal lines. Both horizontal and vertical lines of symmetry occur in H, I and X. Alternatively, you can use the Ctrl+E keyboard shortcut. Symmetry can be viewed when you flip, turn or slide an object. The letter Y has a vertical line of symmetry when it is written as a capital letter. Think of it this way: With reflection symmetry, if you were to draw a line down the center of your logo (horizontal or vertical) and then fold your logo over that line, both halves would be identical. To align text horizontally on a page, highlight the text you want to center. Vertical symmetry can be observed in the majority of simple shapes, like squares, some triangles, circles, hearts, hexagons and octagons. Unfortunately, neither is HIGGLEHAGGLED nor GIBBLEGABBLED, also 13 letters each. Copyright 2023 Wisdom-Advices | All rights reserved. Horizontal Line of Symmetry The Horizontal line of symmetry is a line or axis of a shape which runs across the image, it divides into two identical halves is known as the Horizontal Line of Symmetry. Children will identify five different types of lines discreetly and in the context of shapes and symmetry. The line of symmetry runs through the vertex. Your text will now be horizontally aligned. The words will come from an input file. Letters that lose their rotational symmetry when made lowercase are h and i, while o, s, x and z all keep their rotational symmetry in either form. Iterate over all rows with a for loop and check if the row is symmetric. The Horizontal Line of Symmetry When a horizontal line divides an object into two identical halves, it is called a horizontal line of symmetry. This means you can draw a mirror line down through the middle of each shape and divide it into two reflected halves.