The circumcentre O, centroid G and orthocentre O ' of a triangle are collinear. G divides O′O in the ratio 2: 1 Let the coordinates of G be (x,y). Then (‌
2×5+1×2
2+1
,‌
2×5+1×2
2+1
) =(x,y)⇒(x,y)=(4,4) Hence, coordinates of centroid are (4,4)