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The vertices of a quadrilateral are listed below. A = (2, −3, 1) B = (6,...

The vertices of a quadrilateral are listed below. A = (2, −3, 1) B = (6, 5, −1) C = (7, 2, 2) D = (3, −6, 4) (a) Show that the quadrilateral is a parallelogram. (b) Find the area of the parallelogram.

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