{"id":5836,"date":"2021-12-15T10:08:37","date_gmt":"2021-12-15T10:08:37","guid":{"rendered":"https:\/\/stgwebsite.mindspark.in\/studymaterial\/?page_id=5836"},"modified":"2022-01-03T07:34:18","modified_gmt":"2022-01-03T07:34:18","slug":"centroid-formula-derivation-solved-examples","status":"publish","type":"page","link":"https:\/\/stgwebsite.mindspark.in\/studymaterial\/math-concepts\/centroid-formula-derivation-solved-examples\/","title":{"rendered":"Centroid Formula &#8211; Derivation -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>Centroid Formula &#8211; Derivation -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>Centroid Formula<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">The centroid of a triangle is the point where all three medians of a triangle intersect each other. It is also known as the geometric centre and always lies inside the triangle.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">This point divides every median of the triangle in the ratio of 2:1.<\/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\/centroid-formula-01-300x228.png\" width=\"399\" height=\"303\" alt=\"\" class=\"wp-image-5840 alignnone size-medium\" srcset=\"https:\/\/eistudymaterial.s3.amazonaws.com\/centroid-formula-01-300x228.png 300w, https:\/\/eistudymaterial.s3.amazonaws.com\/centroid-formula-01-480x364.png 480w, https:\/\/eistudymaterial.s3.amazonaws.com\/centroid-formula-01.png 590w\" sizes=\"(max-width: 399px) 100vw, 399px\" \/><\/span><\/p>\n<p style=\"text-align: left;\"><span style=\"font-weight: 400;\"><\/span><\/p>\n<p><span style=\"font-weight: 400;\">The coordinates of all the vertices of \u25b3ABC are given below<\/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\/centroid-formula-02-300x85.png\" width=\"402\" height=\"114\" alt=\"\" class=\"wp-image-5842 alignnone size-medium\" srcset=\"https:\/\/eistudymaterial.s3.amazonaws.com\/centroid-formula-02-300x85.png 300w, https:\/\/eistudymaterial.s3.amazonaws.com\/centroid-formula-02-480x136.png 480w, https:\/\/eistudymaterial.s3.amazonaws.com\/centroid-formula-02.png 536w\" sizes=\"(max-width: 402px) 100vw, 402px\" \/><\/span><\/p>\n<p><span style=\"font-weight: 400;\"><\/span><\/p>\n<p><span style=\"font-weight: 400;\">G is the centroid of \u25b3ABC<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Centroid Formula for <span class=\"katex-eq\" data-katex-display=\"false\">\\triangle \\mathrm{ABC}=\\left(\\frac{x_{a}+x_{b}+x_{c}}{3},\\frac{y_{a}+y_{b}+y_{c}}{3}\\right)<\/span><\/span><\/p>\n<p><span style=\"font-weight: 400;\"><\/span><\/p>\n<h2><b>Derivation<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">In \u25b3ABC<\/span><\/p>\n<p><span style=\"font-weight: 400;\">A, B and C are the vertices having x coordinates and y coordinates as shown below<\/span><\/p>\n<p style=\"text-align: center;\"><span style=\"font-weight: 400;\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/eistudymaterial.s3.amazonaws.com\/centroid-formula-02-300x85.png\" width=\"402\" height=\"114\" \/><\/span><\/p>\n<p><span style=\"font-weight: 400;\"><\/span><\/p>\n<p><span style=\"font-weight: 400;\">P &#8211; Midpoint of BC<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Q &#8211; Midpoint of CA<\/span><\/p>\n<p><span style=\"font-weight: 400;\">R &#8211; Midpoint of AB\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Using section formula, the coordinates of P, Q and R are calculated as shown in the table below:<\/span><span style=\"font-weight: 400;\"><\/span><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\/centroid-formula-03-300x104.png\" width=\"401\" height=\"139\" alt=\"\" class=\"wp-image-5844 alignnone size-medium\" srcset=\"https:\/\/eistudymaterial.s3.amazonaws.com\/centroid-formula-03-300x104.png 300w, https:\/\/eistudymaterial.s3.amazonaws.com\/centroid-formula-03-480x167.png 480w, https:\/\/eistudymaterial.s3.amazonaws.com\/centroid-formula-03.png 537w\" sizes=\"(max-width: 401px) 100vw, 401px\" \/><\/span><\/p>\n<p style=\"text-align: left;\"><span style=\"font-weight: 400;\"><\/span><\/p>\n<p><span style=\"font-weight: 400;\">The point G divides AP in the ratio of 2:1.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Using section formula,<\/span><\/p>\n<p><span style=\"font-weight: 400;\">x coordinate of G <span class=\"katex-eq\" data-katex-display=\"false\">=\\frac{2\\left(\\frac{x_{b}+x_{c}}{2}\\right)+1\\left(x_{a}\\right)}{2+1}=\\frac{x_{a}+x_{b}+x_{c}}{3}<\/span><\/span><\/p>\n<p><span style=\"font-weight: 400;\">y coordinate of G <span class=\"katex-eq\" data-katex-display=\"false\">=\\frac{2\\left(\\frac{y_{b}+y_{c}}{2}\\right)+1\\left(y_{a}\\right)}{2+1}=\\frac{y_{a}+y_{b}+y_{c}}{3}<\/span><\/span><\/p>\n<p><span style=\"font-weight: 400;\">Hence it is proved that the coordinates of centroid G of a triangle are:<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><span class=\"katex-eq\" data-katex-display=\"false\">\\left(\\frac{x_{a}+x_{b}+x_{c}}{3},\\frac{y_{a}+y_{b}+y_{c}}{3}\\right)<\/span><\/span><\/p>\n<p><span style=\"font-weight: 400;\"><\/span><\/p>\n<h2><b>Solved Examples<\/b><\/h2>\n<p><b><\/b><\/p>\n<p><strong>1. The vertices of a triangle are (0,3), (5,6) and (1,2). Find its centroid.<\/strong><\/p>\n<p><strong>Solution:<\/strong><\/p>\n<p style=\"text-align: center;\"><span style=\"font-weight: 400;\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/eistudymaterial.s3.amazonaws.com\/centroid-formula-04-300x84.png\" width=\"404\" height=\"113\" alt=\"\" class=\"wp-image-5846 alignnone size-medium\" srcset=\"https:\/\/eistudymaterial.s3.amazonaws.com\/centroid-formula-04-300x84.png 300w, https:\/\/eistudymaterial.s3.amazonaws.com\/centroid-formula-04-480x134.png 480w, https:\/\/eistudymaterial.s3.amazonaws.com\/centroid-formula-04.png 536w\" sizes=\"(max-width: 404px) 100vw, 404px\" \/><\/span><\/p>\n<p><span style=\"font-weight: 400;\">Let the centroid of \u25b3ABC be G<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Using the centroid formula,<\/span><\/p>\n<p><span style=\"font-weight: 400;\">x coordinate of G <span class=\"katex-eq\" data-katex-display=\"false\">=\\frac{x_{a}+x_{b}+x_{c}}{3}=\\frac{0+5+1}{3}=2<\/span><\/span><\/p>\n<p><span style=\"font-weight: 400;\">y coordinate of G <span class=\"katex-eq\" data-katex-display=\"false\">=\\frac{y_{a}+y_{b}+y_{c}}{3}=\\frac{3+6+2}{3}=\\frac{11}{3}<\/span><\/span><\/p>\n<p><span>Therefore, the coordinates of the centroid are <span class=\"katex-eq\" data-katex-display=\"false\">\\left(2, \\frac{11}{3}\\right)<\/span>.<\/span><\/p>\n<p><span><\/span><\/p>\n<p><strong>2. The centroid of \u25b3ABC is (0,3). <\/strong><strong>Find the coordinates of point A if the other two points are\u00a0 (-2,4) and (2,2).<\/strong><\/p>\n<p><strong>Solution:<\/strong><\/p>\n<p style=\"text-align: center;\"><span style=\"font-weight: 400;\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/eistudymaterial.s3.amazonaws.com\/centroid-formula-05-300x84.png\" width=\"400\" height=\"112\" alt=\"\" class=\"wp-image-5848 alignnone size-medium\" srcset=\"https:\/\/eistudymaterial.s3.amazonaws.com\/centroid-formula-05-300x84.png 300w, https:\/\/eistudymaterial.s3.amazonaws.com\/centroid-formula-05-480x134.png 480w, https:\/\/eistudymaterial.s3.amazonaws.com\/centroid-formula-05.png 536w\" sizes=\"(max-width: 400px) 100vw, 400px\" \/><\/span><\/p>\n<p style=\"text-align: left;\"><span style=\"font-weight: 400;\"><\/span><\/p>\n<p><span style=\"font-weight: 400;\">Using centroid formula\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">x coordinate of G <span class=\"katex-eq\" data-katex-display=\"false\">=\\frac{x_{a}+x_{b}+x_{c}}{3}=\\frac{x-2+2}{3}<\/span><\/span><\/p>\n<p><span class=\"katex-eq\" data-katex-display=\"false\">\n\\Rightarrow \\frac{x-2+2}{3}=0 <\/span><br \/><span class=\"katex-eq\" data-katex-display=\"false\">\\Rightarrow x=0\n<\/span><\/p>\n<p><span style=\"font-weight: 400;\">y coordinate of <span class=\"katex-eq\" data-katex-display=\"false\">\\mathrm{G}=\\frac{y_{a}+y_{b}+y_{c}}{3}=\\frac{y+4+2}{3}<\/span><\/span><\/p>\n<span class=\"katex-eq\" data-katex-display=\"false\">\\Rightarrow \\quad \\frac{y+2+2}{3}=3<\/span>\n<p><span style=\"font-weight: 400;\"><span class=\"katex-eq\" data-katex-display=\"false\">\\Rightarrow y+4=9<\/span><\/span><\/p>\n<p><span style=\"font-weight: 400;\"><span class=\"katex-eq\" data-katex-display=\"false\">\\therefore y=9-4=5<\/span><\/span><\/p>\n<p><span style=\"font-weight: 400;\">Hence the coordinate of point A is (0,5).<\/span><\/p>\n<p>[\/et_pb_text][\/et_pb_column][et_pb_column type=&#8221;2_5&#8243; 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_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. Define the centroid of a triangle?<br \/><\/strong><\/h3>\n<p><span style=\"font-weight: 400;\"><strong>Ans: <\/strong><\/span><span style=\"font-weight: 400;\">The point where all three medians of a triangle meet each other is termed the centroid of the triangle.<\/span><span style=\"font-weight: 400;\"><strong><\/strong><strong><\/strong><\/span><span style=\"font-weight: 400;\"><\/span><\/p>\n<h3><strong>Q2. What is the centroid formula?<br \/><\/strong><\/h3>\n<p><strong>Ans: <\/strong><span style=\"font-weight: 400;\">It is a formula for the coordinates of the centroid of a triangle.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The centroid formula of a triangle is <span class=\"katex-eq\" data-katex-display=\"false\">\\left(\\frac{x_{a}+x_{b}+x_{c}}{3},\\frac{y_{a}+y_{b}+y_{c}}{3}\\right)<\/span><\/span><span style=\"font-weight: 400;\">, <\/span><span style=\"font-weight: 400;\">where <span class=\"katex-eq\" data-katex-display=\"false\">\\left(x_{a}, y_{a}\\right),\\left(x_{b}, y_{b}\\right) \\text { and }\\left(x_{c}, y_{c}\\right)<\/span> <\/span><span style=\"font-weight: 400;\">are the coordinates of the vertices of the triangle.<\/span><span style=\"font-weight: 400;\"><\/span><\/p>\n<h3><strong>Q3. Which formula is used to derive the centroid formula?<br \/><\/strong><\/h3>\n<p><strong>Ans: <\/strong><span style=\"font-weight: 400;\">Section formula is used to derive the centroid formula.<\/span><\/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>Centroid Formula - Derivation -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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