
There is quadrilateral ABCD. Point P is the center of gravity of triangle ABC. Point Q is the center of gravity of triangle ACD.Point R is the center of gravity of triangle ABD.Point S is the center of gravity of triangle BCD. Segmets PQ and the RS cross at point X. What is point X of the quadrilateral? When point X is consistent with P or Q or R or S, what is the shape of the quadrilateral ? When point X is consistent with point of intersection AC and BD, what is the shape of the quadrilateral ? @You can also move points A, B, C, D on CABRI. 