What are the coordinates of the centroid of a triangle with vertices P(−4, −1) , Q(2, 2) , and R(2, −3) ?
This is easy....the centroid is given by :
[ ( add the x coordinates of the vertices ) / 3, ( add the y coordinates of the vertices ) / 3 ]
So we have
[ ( -4 + 2 + 2 ) / 3 , ( -1 + 2 + -3 ) / 3 ]
[ 0 / 3 , - 2/3 ]
( 0 , - 2/3 )
+8 
