Question: A given parallelogram, ABCD, has vertices at A(2,-1,4), B(1,0,-1), C(1,2,3), and D. Find a) the coordinates of D. A(2, -1, 4) b) the cosine

A given parallelogram, ABCD, has vertices at A(2,-1,4), B(1,0,-1), C(1,2,3), and D.

A given parallelogram, ABCD, has vertices at A(2,-1,4), B(1,0,-1), C(1,2,3), and D. Find a) the coordinates of D. A(2, -1, 4) b) the cosine of the interior angle at B. C(I, 2, 3) c) the vector projection of BA onto BC. B(1.0. -1) d) the area of the parallelogram. e) an equation for the plane of the parallelogram.

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