The amazing quadrilateral property—with coordinates Prove the quadrilateral property, assuming the coordinates of P, Q, R, and S are P(x1, y1, 0), Q(x2, y2, 0), R(x3, y3, 0), and S(x4, y4, z4), where we assume P, Q, and R lie in the xy-plane without loss of generality.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter3: Functions And Graphs
Section3.3: Lines
Problem 74E
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The amazing quadrilateral property—with coordinates Prove the quadrilateral property, assuming the coordinates of P, Q, R, and S are P(x1, y1, 0), Q(x2, y2, 0), R(x3, y3, 0), and S(x4, y4, z4), where we assume P, Q, and R lie in the xy-plane without loss of generality. 

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It is given that the co-ordinates are Px1,y1,0,Qx2,y2,0,Rx3,y3,0 and Sx4,y4,z4

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