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OpenStudy (anonymous):
The coordinates of points P,Q,R, and S are given. (a) Show that the four points are coplanar. (b) Determine whether quadrilateral PQRS is a parallelogram. (c) Find the area of quadrilateral PQRS. P(2,-3,8) Q(-2,4,6) R(7,18,-7) S(15,4,-3)
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