the center of quadrilateral part1@@
@There is Quadrilateral ABCD. Point P is the middle point of AB. Point Q is the middle point of BC. Point R is the middle point of CD. Point S is the middle point of AD. PR and QS meet on Point O.

Move points(A,B,C,D) to find the geometric quality among the points(A,B,C,D,O).
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Download CABRIU data (d95) from here.