{"id":5936,"date":"2021-12-16T03:06:35","date_gmt":"2021-12-16T03:06:35","guid":{"rendered":"https:\/\/stgwebsite.mindspark.in\/studymaterial\/?page_id=5936"},"modified":"2022-01-03T08:00:43","modified_gmt":"2022-01-03T08:00:43","slug":"number-of-diagonals-of-a-polygon-solved-examples","status":"publish","type":"page","link":"https:\/\/stgwebsite.mindspark.in\/studymaterial\/math-concepts\/number-of-diagonals-of-a-polygon-solved-examples\/","title":{"rendered":"Number of diagonals of a polygon &#8211; Solved Examples"},"content":{"rendered":"<p>[et_pb_section fb_built=&#8221;1&#8243; admin_label=&#8221;Section&#8221; module_class=&#8221;mainsec&#8221; _builder_version=&#8221;4.10.4&#8243; _module_preset=&#8221;default&#8221; background_color=&#8221;#e0f2fd&#8221; z_index=&#8221;1&#8243; custom_padding=&#8221;5px||5px||true|false&#8221; locked=&#8221;off&#8221; collapsed=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_row column_structure=&#8221;3_5,2_5&#8243; custom_padding_last_edited=&#8221;on|phone&#8221; _builder_version=&#8221;4.10.8&#8243; _module_preset=&#8221;default&#8221; background_color=&#8221;#FFFFFF&#8221; width=&#8221;100%&#8221; max_width=&#8221;1310px&#8221; custom_padding=&#8221;|51px|40px|51px|false|true&#8221; custom_padding_tablet=&#8221;&#8221; custom_padding_phone=&#8221;|40px|30px|40px|false|true&#8221; border_radii=&#8221;on|10px|10px|10px|10px&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;3_5&#8243; admin_label=&#8221;Column L&#8221; _builder_version=&#8221;4.9.10&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text admin_label=&#8221;Acute Angles<br \/>\n&#8221; _builder_version=&#8221;4.13.1&#8243; _module_preset=&#8221;default&#8221; header_font=&#8221;|700|||||||&#8221; header_text_align=&#8221;left&#8221; header_font_size=&#8221;50px&#8221; header_line_height=&#8221;1.18em&#8221; custom_padding=&#8221;|0px||4px|false|false&#8221; header_font_size_tablet=&#8221;&#8221; header_font_size_phone=&#8221;35px&#8221; header_font_size_last_edited=&#8221;on|phone&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<h1>Number of diagonals of a polygon &#8211; Solved Examples<\/h1>\n<p>[\/et_pb_text][et_pb_text admin_label=&#8221;Text&#8221; _builder_version=&#8221;4.13.1&#8243; _module_preset=&#8221;default&#8221; text_font_size=&#8221;16px&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;#a01414&#8243; header_3_font=&#8221;|600|||||||&#8221; custom_padding=&#8221;15px|15px|54px|4px|false|false&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<h2><b>Number of diagonals of a polygon\u00a0<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">A line segment connecting any two vertices (non-adjacent) of a polygon is known as the diagonal of the polygon. A polygon needs to have at least 4 sides to have a diagonal. Triangle having three sides doesn\u2019t have a diagonal because all the three vertices are adjacent to each other.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The number of diagonals of a polygon having \u201ca\u201d number of sides is equal to<span class=\"katex-eq\" data-katex-display=\"false\">\\frac{a(a-3)}{2}<\/span> where (a &gt; 3).<\/span><\/p>\n<p><span style=\"font-weight: 400;\">From each vertex (a &#8211; 3) diagonals can be drawn. So, from \u201ca \u201cnumber of vertices a total of \u201ca (a &#8211; 3)\u201d diagonals can be drawn. But the diagonals drawn from opposite sides should be counted as one. Hence by discarding the duplicates, a total number of <span class=\"katex-eq\" data-katex-display=\"false\">\\frac{a(a-3)}{2}<\/span> <\/span><span style=\"font-weight: 400;\">diagonals can be drawn in a polygon having \u201ca\u201d sides.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><\/span><\/p>\n<p><span style=\"font-weight: 400;\">Let us find the number of diagonals of some polygons using the above formula.<\/span><\/p>\n<p><strong>1. Quadrilateral<\/strong><\/p>\n<p><span style=\"font-weight: 400;\">Number of sides (a) = 4<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><span class=\"katex-eq\" data-katex-display=\"false\">\\text { Number of diagonals }=\\frac{a(a-3)}{2}=\\frac{4(4-3)}{2}=\\frac{4 \\times 1}{2}=2<\/span><\/span><\/p>\n<p><span style=\"font-weight: 400;\"><\/span><\/p>\n<p><strong>2. Pentagon\u00a0<\/strong><\/p>\n<p><span style=\"font-weight: 400;\">Number of sides (a) = 5<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><span class=\"katex-eq\" data-katex-display=\"false\">\\text { Number of diagonals }=\\frac{a(a-3)}{2}=\\frac{5(5-3)}{2}=\\frac{5 \\times 2}{2}=5<\/span><\/span><\/p>\n<p><span style=\"font-weight: 400;\"><\/span><\/p>\n<p><strong>3. Hexagon\u00a0<\/strong><\/p>\n<p><span style=\"font-weight: 400;\">Number of sides (a) = 6<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><span class=\"katex-eq\" data-katex-display=\"false\">\\text { Number of diagonals }=\\frac{a(a-3)}{2}=\\frac{6(6-3)}{2}=\\frac{6 \\times 3}{2}=9<\/span><\/span><\/p>\n<p><span style=\"font-weight: 400;\"><\/span><\/p>\n<p><strong>4. Heptagon\u00a0<\/strong><\/p>\n<p><span style=\"font-weight: 400;\">Number of sides (a) = 7<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><span class=\"katex-eq\" data-katex-display=\"false\">\\text { Number of diagonals }=\\frac{a(a-3)}{2}=\\frac{7(7-3)}{2}=\\frac{7 \\times 4}{2}=14<\/span><\/span><\/p>\n<p><span style=\"font-weight: 400;\"><\/span><\/p>\n<p style=\"text-align: center;\"><span style=\"font-weight: 400;\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/eistudymaterial.s3.amazonaws.com\/number-of-diagonals-in-a-polygon-01-300x92.png\" width=\"600\" height=\"184\" alt=\"\" class=\"wp-image-5940 alignnone size-medium\" srcset=\"https:\/\/eistudymaterial.s3.amazonaws.com\/number-of-diagonals-in-a-polygon-01-300x92.png 300w, https:\/\/eistudymaterial.s3.amazonaws.com\/number-of-diagonals-in-a-polygon-01-768x236.png 768w, https:\/\/eistudymaterial.s3.amazonaws.com\/number-of-diagonals-in-a-polygon-01-480x148.png 480w, https:\/\/eistudymaterial.s3.amazonaws.com\/number-of-diagonals-in-a-polygon-01.png 851w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/span><\/p>\n<p style=\"text-align: center;\"><span style=\"font-weight: 400;\"><\/span><\/p>\n<p style=\"text-align: left;\"><span style=\"font-weight: 400;\">Given Below is the table showing the number of diagonals for different types of polygon.<\/span><\/p>\n<p style=\"text-align: center;\"><span style=\"font-weight: 400;\"><\/span><\/p>\n<p style=\"text-align: center;\"><span style=\"font-weight: 400;\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/eistudymaterial.s3.amazonaws.com\/polygon-diagonals-300x142.png\" width=\"501\" height=\"237\" alt=\"\" class=\"wp-image-6122 alignnone size-medium\" srcset=\"https:\/\/eistudymaterial.s3.amazonaws.com\/polygon-diagonals-300x142.png 300w, https:\/\/eistudymaterial.s3.amazonaws.com\/polygon-diagonals-1024x485.png 1024w, https:\/\/eistudymaterial.s3.amazonaws.com\/polygon-diagonals-768x364.png 768w, https:\/\/eistudymaterial.s3.amazonaws.com\/polygon-diagonals-1080x512.png 1080w, https:\/\/eistudymaterial.s3.amazonaws.com\/polygon-diagonals-1280x607.png 1280w, https:\/\/eistudymaterial.s3.amazonaws.com\/polygon-diagonals-980x464.png 980w, https:\/\/eistudymaterial.s3.amazonaws.com\/polygon-diagonals-480x227.png 480w, https:\/\/eistudymaterial.s3.amazonaws.com\/polygon-diagonals.png 1452w\" sizes=\"(max-width: 501px) 100vw, 501px\" \/><\/span><\/p>\n<p style=\"text-align: center;\"><span style=\"font-weight: 400;\"><\/span><\/p>\n<h2><b>Solved Examples<\/b><\/h2>\n<p><b><\/b><\/p>\n<p><b>1. How many diagonals does a nonagon have?<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Nonagon is a polygon having 9 sides<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Number of sides (a) = 9<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Number of diagonals <span class=\"katex-eq\" data-katex-display=\"false\">=\\frac{a(a-3)}{2}=\\frac{9(9-3)}{2}=\\frac{9 \\times 6}{2}=27<\/span><\/span><\/p>\n<p><span style=\"font-weight: 400;\">Hence there are 27 diagonals in a nonagon.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><\/span><\/p>\n<p><b>2. A polygon has 54 diagonals. Find the number of sides of this polygon.<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Number of diagonals\u00a0 <span class=\"katex-eq\" data-katex-display=\"false\">=\\frac{a(a-3)}{2}<\/span><\/span><span style=\"font-weight: 400;\"><\/span><\/p>\n<p><span style=\"font-weight: 400;\"><span class=\"katex-eq\" data-katex-display=\"false\">\\Rightarrow \\quad 54=\\frac{a(a-3)}{2}<\/span><\/span><\/p>\n<p><span style=\"font-weight: 400;\"><span class=\"katex-eq\" data-katex-display=\"false\">\\Rightarrow a(a-3)=54 \\times 2=108<\/span><\/span><\/p>\n<p><span style=\"font-weight: 400;\"><span class=\"katex-eq\" data-katex-display=\"false\">\\Rightarrow \\quad a=12<\/span><\/span><\/p>\n<p><span style=\"font-weight: 400;\">Hence the polygon having 54 diagonals have 12 sides.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><\/span><\/p>\n<p>[\/et_pb_text][\/et_pb_column][et_pb_column type=&#8221;2_5&#8243; module_id=&#8221;stickysideR&#8221; admin_label=&#8221;Column R&#8221; _builder_version=&#8221;4.10.4&#8243; 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_module_preset=&#8221;default&#8221; text_line_height=&#8221;2.2em&#8221; link_font_size=&#8221;16px&#8221; custom_margin=&#8221;||0px||false|false&#8221; custom_padding=&#8221;10px|15px|10px|28px|true|false&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<div>\n<div class=\"trr\"><a href=\"https:\/\/stgwebsite.mindspark.in\/wordpress\/math-concepts\/#geometry\" class=\"otherc\">Geometry<\/a><\/div>\n<div class=\"trr\"><a href=\"https:\/\/stgwebsite.mindspark.in\/wordpress\/math-concepts\/#trigonometry\" class=\"otherc\">Trigonometry<\/a><\/div>\n<div class=\"trr\"><a href=\"https:\/\/stgwebsite.mindspark.in\/wordpress\/math-concepts\/#operations\" class=\"otherc\">Operations<\/a><\/div>\n<div class=\"trr\"><a href=\"https:\/\/stgwebsite.mindspark.in\/wordpress\/math-concepts\/#numbers\" class=\"otherc\">Numbers<\/a><\/div>\n<\/div>\n<p>[\/et_pb_text][et_pb_text admin_label=&#8221;Related Concepts<br \/>\n&#8221; _builder_version=&#8221;4.9.11&#8243; _module_preset=&#8221;default&#8221; header_font=&#8221;|700|||||||&#8221; header_font_size=&#8221;25px&#8221; text_orientation=&#8221;center&#8221; custom_margin=&#8221;0px||0px||true|false&#8221; custom_padding=&#8221;8px|15px|0px|15px|false|true&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<h1>Related Concepts<\/h1>\n<p>[\/et_pb_text][et_pb_text _builder_version=&#8221;4.13.1&#8243; _module_preset=&#8221;default&#8221; text_line_height=&#8221;2.2em&#8221; link_font_size=&#8221;16px&#8221; custom_margin=&#8221;||0px||false|false&#8221; custom_padding=&#8221;10px|15px|10px|28px|true|false&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<div>\n<div class=\"trr\"><a href=\"https:\/\/mindspark.in\/studymaterial\/math-concepts\/convex-polygon-with-examples-and-faqs\/\" class=\"otherc\">Convex Polygon<\/a><\/div>\n<div class=\"trr\"><a href=\"https:\/\/mindspark.in\/studymaterial\/math-concepts\/area-of-octagon-formula-and-solved-examples\/\" class=\"otherc\">Area of Octagon<\/a><\/div>\n<div class=\"trr\"><a href=\"https:\/\/mindspark.in\/studymaterial\/math-concepts\/area-of-regular-hexagon-mindspark\/\" class=\"otherc\">Area of regular Hexagon<\/a><a href=\"#\" class=\"otherc\"><\/a><\/div>\n<\/div>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row admin_label=&#8221;Row for space&#8221; 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_builder_version=&#8221;4.9.10&#8243; _module_preset=&#8221;default&#8221; text_orientation=&#8221;center&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<div class=\"ffmanage\">\n<div class=\"textmanagestyle\">\n<div class=\"fone\">\n<p>Ready to get started ?<\/p>\n<\/div>\n<div class=\"sone\">\n<p class=\"ffbtn\"><a href=\"https:\/\/mindspark.in\/free-trial\">Start Free Trial<\/a><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>[\/et_pb_text][et_pb_image src=&#8221;https:\/\/stgwebsite.mindspark.in\/wordpress\/wp-content\/uploads\/2021\/08\/down-circle.png&#8221; title_text=&#8221;down-circle&#8221; show_bottom_space=&#8221;off&#8221; align=&#8221;right&#8221; module_class=&#8221;img2&#8243; _builder_version=&#8221;4.9.10&#8243; _module_preset=&#8221;default&#8221; width=&#8221;44px&#8221; height=&#8221;18px&#8221; custom_padding=&#8221;2px||2px||true|false&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][\/et_pb_column][\/et_pb_row][et_pb_row admin_label=&#8221;FAQ Row&#8221; _builder_version=&#8221;4.9.11&#8243; _module_preset=&#8221;default&#8221; width=&#8221;100%&#8221; max_width=&#8221;1310px&#8221; custom_padding=&#8221;|40px||40px|false|true&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.9.11&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text admin_label=&#8221;FAQ&#8221; module_class=&#8221;faqstyl&#8221; _builder_version=&#8221;4.13.1&#8243; _module_preset=&#8221;default&#8221; text_font_size=&#8221;16px&#8221; header_font=&#8221;|700|||||||&#8221; header_text_align=&#8221;center&#8221; header_line_height=&#8221;2.5em&#8221; background_color=&#8221;#dbedc6&#8243; max_width=&#8221;80%&#8221; module_alignment=&#8221;center&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;30px|25px|30px|25px|true|true&#8221; border_radii=&#8221;on|10px|10px|10px|10px&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<h1>Frequently Asked Questions<span style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">\u00a0<\/span><\/span><\/h1>\n<ol><\/ol>\n<h3><strong>Q1.\u00a0<\/strong><b>Define the diagonal of a polygon?<\/b><strong><br \/><\/strong><\/h3>\n<p><span style=\"font-weight: 400;\"><strong>Ans:\u00a0<\/strong><\/span>A line segment connecting any two vertices (non-adjacent) of a polygon is known as the diagonal of the polygon.<span style=\"font-size: 16px;\"><\/span><\/p>\n<h3><strong>Q2.\u00a0<\/strong><b>What is the minimum number of sides required in a polygon to have a diagonal?<\/b><\/h3>\n<p><strong>Ans:\u00a0<\/strong>A polygon needs to have at least 4 sides to have a diagonal. Triangle having three sides doesn\u2019t have a diagonal because all the three vertices are adjacent to each other.<\/p>\n<h3 style=\"background-color: #dbedc6;\"><span style=\"font-size: 22px; font-weight: bold;\">Q3.\u00a0<\/span><b>How to calculate the exact number of diagonals in a polygon?<\/b><\/h3>\n<p><strong>Ans:<\/strong> The number of diagonals of a polygon having \u201ca\u201d number of sides is equal to <span class=\"katex-eq\" data-katex-display=\"false\">\\frac{a(a-3)}{2}<\/span> where (a &gt; 3).<\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Meta Description: We can calculate the sum of the terms in a geometric progression using the formula  S = a(1-r^n)\/(1-r) when r < 1 and  S = a(r^n-1)\/(r-1)when r>1<\/p>\n","protected":false},"author":10,"featured_media":0,"parent":714,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v17.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Number of diagonals of a polygon - Solved Examples - mydomain<\/title>\n<meta name=\"description\" content=\"Meta Description: We can calculate the sum of the terms in a geometric progression using the formula S = a(1-r^n)\/(1-r) when r &lt; 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