the vertices of triangle is (- 4,6), (3 ,- 2), (- 2,5 ).find the co-ordinate of its centre
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O(x,y) = ( x1+x2+x3/3, y1+y2+y3/3)
⇒( (-4)+3-2/3, 6-2+5/3)
= (-3/3,9/3)
= (-1,3)
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