ORIGAMI part1@@
@There is a rectangle.Quadrilateral ASRD and Quadrilateral PSRD' are congruence.Point P moves on Line BC.

Move point P to find the geometric quality of the three triangles(PBS,PQC,QRD').
@You can also move points (A,B,C,P) on CABRI.

Download CABRIU data (d49) from here.