{"id":4004,"date":"2021-08-13T17:42:17","date_gmt":"2021-08-13T17:42:17","guid":{"rendered":"https:\/\/mathemerize.com\/?p=4004"},"modified":"2021-11-30T16:31:13","modified_gmt":"2021-11-30T11:01:13","slug":"centroid-in-a-triangle","status":"publish","type":"post","link":"https:\/\/mathemerize.com\/centroid-in-a-triangle\/","title":{"rendered":"Centroid in a Triangle – Formula and Example"},"content":{"rendered":"
Here you will learn formula for centroid of triangle and how to find centroid in a triangle with example.<\/p>\n
Let’s begin –<\/p>\n
If A(\\(x_1,y_1\\)), B(\\(x_2,y_2\\)) and C(\\(x_3,y_3\\)) are vertices of any triangle ABC, then<\/p>\n
The centroid is the point of the intersection of the medians(line joining the mid-point of sides and opposite vertices).<\/p>\n
Centroid divides each median in the ratio of 2 : 1.<\/p>\n
The formula for centroid of a triangle is<\/p>\n
\n(\\(x_1+x_2+x_3\\over 3\\),\\(y_1+y_2+y_3\\over 3\\))<\/p>\n<\/blockquote>\n
where \\(x_1\\), \\(x_2\\), and \\(x_3\\) are x-coordinates of the vertices of the triangle; and \\(y_1\\), \\(y_2\\), and \\(y_3\\) are y-coordinates of the vertices of the triangle.<\/p>\n\n\n
Example 1 : <\/span>Find the centroid of a triangle whose vertices are (6,4), (3,1) and (1,2).<\/p>\n
Solution : <\/span>Given coordinates of triangle
\n \\(x_1, y_1\\) = (5,4)
\n \\(x_2, y_2\\) = (3,3)
\n \\(x_3, y_3\\) = (1,2)
\n centroid = (\\(x_1+x_2+x_3\\over 3\\),\\(y_1+y_2+y_3\\over 3\\))
\n = (\\(5+3+1\\over 3\\), \\(4+3+2\\over 3\\))
\n = (3,3)
\n Hence centroid is (3,3)<\/p>\n\n\n\nExample 2 : <\/span>Find the centroid of a triangle whose vertices are (0,1), (2,0) and (-3,0).<\/p>\n
Solution : <\/span>Given coordinates of triangle
\n \\(x_1, y_1\\) = (0,1)
\n \\(x_2, y_2\\) = (2,0)
\n \\(x_3, y_3\\) = (-3,0)
\n centroid = (\\(x_1+x_2+x_3\\over 3\\),\\(y_1+y_2+y_3\\over 3\\))
\n = (\\(0+2-3\\over 3\\), \\(1+0+0\\over 3\\))
\n = (\\(-1\\over 3\\), \\(1\\over 3\\))
\n Hence centroid is (\\(-1\\over 3\\), \\(1\\over 3\\))<\/p>\n\n\nCondition for collinearity of three given points<\/h2>\n
Three given points A(\\(x_1,y_1\\)), B(\\(x_2,y_2\\)) and C(\\(x_3,y_3\\)) are collinear if any one of the following conditions are satisfied<\/p>\n
\n(i) Area of triangle ABC is zero.<\/p>\n
(ii) Slope of AB = Slope of BC = Slope of AC. i.e. \\(y_2-y_1\\over {x_2-x_1}\\) = \\(y_3-y_2\\over {x_3-x_2}\\) = \\(y_3-y_1\\over {x_3-x_1}\\)<\/p>\n
(iii) find the equation of line passing through 2 given points, if the third point satisfies the given equation of the line, then three points are collinear.<\/p>\n<\/blockquote>\n
Hope you learnt formula of centroid. To learn more practice more questions to get ahead in competition. Good Luck!<\/p>\n\n\n