The amazing quadrilateral propertywith coordinates Prove
Chapter 11, Problem 84(choose chapter or problem)
The amazing quadrilateral propertywith coordinates Prove the quadrilateral property in Exercise 83, assuming the coordinates of P, Q, R, and S are P1x1, y1, 02, Q1x2, y2, 02, R1x3, y3, 02, and S1x4, y4, z42, where we assume that P, Q, and R lie in the xy-plane without loss of generality.
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