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Question

A (3, 2) and B (−2, 1) are two vertices of a triangle ABC whose centroid G has the coordinates 53,-13. Find the coordinates of the third vertex C of the triangle.

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Solution

We have to find the co-ordinates of the third vertex of the given triangle. Let the co-ordinates of the third vertex be.

The co-ordinates of other two vertices are A (3, 2) and C (−2, 1)

The co-ordinate of the centroid is

We know that the co-ordinates of the centroid of a triangle whose vertices are is-

So,

Compare individual terms on both the sides-

So,

Similarly,

So,

So the co-ordinate of third vertex


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