{"id":5274,"date":"2021-12-04T08:19:32","date_gmt":"2021-12-04T08:19:32","guid":{"rendered":"https:\/\/stgwebsite.mindspark.in\/studymaterial\/?page_id=5274"},"modified":"2022-01-03T07:53:32","modified_gmt":"2022-01-03T07:53:32","slug":"angle-sum-property-of-a-triangle","status":"publish","type":"page","link":"https:\/\/stgwebsite.mindspark.in\/studymaterial\/math-concepts\/angle-sum-property-of-a-triangle\/","title":{"rendered":"ANGLE SUM PROPERTY OF A TRIANGLE"},"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;4.11.3&#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>ANGLE SUM PROPERTY OF A TRIANGLE<\/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>ANGLE SUM PROPERTY OF A TRIANGLE\u00a0<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">A triangle is a polygon that has three sides and three interior angles. It is the smallest polygon. It has three vertices. It can be an acute, obtuse or right-angled triangle. The sum of the interior angles will always remain 180 degrees. The angle sum property of a triangle is one of the most frequently used properties in geometry and is used to calculate unknown angles.<\/span><\/p>\n<p><b>It states that the sum of interior angles of a triangle is 180 degrees<\/b><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p>&nbsp;<\/p>\n<h2><b>PROPERTIES OF A TRIANGLE<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">There are various properties of a triangle.<\/span><\/p>\n<ol>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">A triangle has three sides, three vertices and three angles.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The sum of all the angles inside of a triangle is always equal to 180 degrees. It does not matter which kind of a triangle it is.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The sum of the length of any of the two sides of a triangle will always be greater than the length of the third side.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The side which is opposite to the largest angle of a triangle is the largest.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">An exterior angle (angle outside the triangle) of the triangle is equal to the sum of the opposite interior angles. This is also known as the exterior angle property of a triangle.<\/span><\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<h3><b>PROOF OF THE PROPERTY<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Let us consider the triangle ABC where AB, BC and AC are sides of a triangle. <\/span><span style=\"font-weight: 400;\">\u2220<\/span><span style=\"font-weight: 400;\">ABC, <\/span><span style=\"font-weight: 400;\">\u2220<\/span><span style=\"font-weight: 400;\">BCA and <\/span><span style=\"font-weight: 400;\">\u2220<\/span><span style=\"font-weight: 400;\">BAC are the interior angles of a triangle.\u00a0<\/span><\/p>\n<p style=\"text-align: center;\"><span style=\"font-weight: 400;\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/eistudymaterial.s3.amazonaws.com\/trinagle-onen-300x224.png\" width=\"300\" height=\"224\" alt=\"\" class=\"wp-image-5277 alignnone size-medium\" srcset=\"https:\/\/eistudymaterial.s3.amazonaws.com\/trinagle-onen-300x224.png 300w, https:\/\/eistudymaterial.s3.amazonaws.com\/trinagle-onen-510x382.png 510w, https:\/\/eistudymaterial.s3.amazonaws.com\/trinagle-onen-480x359.png 480w, https:\/\/eistudymaterial.s3.amazonaws.com\/trinagle-onen.png 523w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/span><\/p>\n<p><b>Proof:<\/b><span style=\"font-weight: 400;\"> Draw a line PQ parallel to the base of the triangle BC.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">PQ is a straight line so <\/span><span style=\"font-weight: 400;\">\u2220<\/span><span style=\"font-weight: 400;\">PAB +<\/span><span style=\"font-weight: 400;\">\u2220<\/span><span style=\"font-weight: 400;\">BAC + <\/span><span style=\"font-weight: 400;\">\u2220<\/span><span style=\"font-weight: 400;\">QAC = 180\u00b0\u00a0 <\/span> <span style=\"font-weight: 400;\">&#8212;&#8212;-(1)<\/span><\/p>\n<p><span style=\"font-weight: 400;\">We also know that, <\/span><span style=\"font-weight: 400;\">\u2220<\/span><span style=\"font-weight: 400;\">PAB = <\/span><span style=\"font-weight: 400;\">\u2220<\/span><span style=\"font-weight: 400;\">ABC and <\/span><span style=\"font-weight: 400;\">\u2220<\/span><span style=\"font-weight: 400;\">QAC = <\/span><span style=\"font-weight: 400;\">\u2220<\/span><span style=\"font-weight: 400;\">BCA (Since PQ is parallel to BC and AB is the transversal; Corresponding angles are equal when a transversal intersects parallel lines)<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Substituting the values of <\/span><span style=\"font-weight: 400;\">\u2220<\/span><span style=\"font-weight: 400;\">PAB and <\/span><span style=\"font-weight: 400;\">\u2220<\/span><span style=\"font-weight: 400;\">QAC in equation (1)<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u2220<\/span><span style=\"font-weight: 400;\">ABC +<\/span><span style=\"font-weight: 400;\">\u2220<\/span><span style=\"font-weight: 400;\">BAC + <\/span><span style=\"font-weight: 400;\">\u2220<\/span><span style=\"font-weight: 400;\">BCA\u00a0 = 180\u00b0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Hence proved.\u00a0<\/span><span style=\"font-weight: 400;\"><\/span><\/p>\n<p><span style=\"font-weight: 400;\"><\/span><\/p>\n<h2><b>Examples\u00a0<\/b><\/h2>\n<p><b><\/b><\/p>\n<h3><b>1. If in a triangle ABC, <\/b><b>\u2220<\/b><b>A = 38\u00b0, <\/b><b>\u2220<\/b><b>B = 96\u00b0. Then what is the value of <\/b><b>\u2220<\/b><b>C?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Since the sum of all the angles inside a triangle\u00a0 is 180\u00b0 so:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u2220<\/span><span style=\"font-weight: 400;\">A + <\/span><span style=\"font-weight: 400;\">\u2220<\/span><span style=\"font-weight: 400;\">B + <\/span><span style=\"font-weight: 400;\">\u2220<\/span><span style=\"font-weight: 400;\">C = 180\u00b0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u21d2 38\u00b0 + 96\u00b0 + <\/span><span style=\"font-weight: 400;\">\u2220<\/span><span style=\"font-weight: 400;\">C = 180\u00b0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u21d2 \u2220<\/span><span style=\"font-weight: 400;\">C = 180\u00b0 &#8211; 134\u00b0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u00a0 \u2234 \u2220<\/span><span style=\"font-weight: 400;\">C = 46\u00b0<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><\/span><\/p>\n<p><b>2. In a triangle PQR, What is the value of <\/b><b>\u2220<\/b><b>P in a triangle which is right-angled at Q and <\/b><b>\u2220<\/b><b>R = 35\u00b0?<\/b><\/p>\n<p><span style=\"font-weight: 400;\">We know that, <\/span><span style=\"font-weight: 400;\">\u2220<\/span><span style=\"font-weight: 400;\">P + <\/span><span style=\"font-weight: 400;\">\u2220<\/span><span style=\"font-weight: 400;\">Q + <\/span><span style=\"font-weight: 400;\">\u2220<\/span><span style=\"font-weight: 400;\">R = 180\u00b0.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u2220<\/span><span style=\"font-weight: 400;\">P + 90\u00b0 + 35\u00b0 = 180\u00b0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u21d2 \u2220<\/span><span style=\"font-weight: 400;\">P = 180\u00b0 &#8211; 125\u00b0<\/span><\/p>\n<p><span style=\"font-weight: 400;\"> \u2234 \u2220<\/span><span style=\"font-weight: 400;\">P = 55\u00b0<\/span><\/p>\n<p>[\/et_pb_text][\/et_pb_column][et_pb_column type=&#8221;2_5&#8243; module_id=&#8221;stickysideR&#8221; 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locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<h1>Explore Other Topics<\/h1>\n<p>[\/et_pb_text][et_pb_text _builder_version=&#8221;4.10.7&#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:\/\/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; 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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: What is the angle sum property of a triangle?<br \/><\/strong><\/h3>\n<p><span style=\"font-weight: 400;\"><strong>Ans: <\/strong>The property states that the sum of all the interior angles of a triangle is 180\u00b0.<strong><br \/><\/strong><\/span><span style=\"font-weight: 400;\"><\/span><\/p>\n<h3><strong>Q2. Which side of the triangle is always the largest side?<br \/><\/strong><\/h3>\n<p><strong>Ans: <\/strong>The side which is opposite to the largest angle is the largest side of the triangle.<strong><br \/><\/strong><strong><br \/><\/strong><\/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>ANGLE SUM PROPERTY OF A TRIANGLE - 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; 1 and S = a(r^n-1)\/(r-1)when r&gt;1\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/stgwebsite.mindspark.in\/studymaterial\/math-concepts\/angle-sum-property-of-a-triangle\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ANGLE SUM PROPERTY OF A TRIANGLE - 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