21. The vertices of a quadrilateral are A = [0, 3,5], B = (-3,-1,17], C = [4,-3,15] & D = [7, 1,3]. Prove that ABCD is a
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21. The vertices of a quadrilateral are A = [0, 3,5], B = (-3,-1,17], C = [4,-3,15] & D = [7, 1,3]. Prove that ABCD is a
21. The vertices of a quadrilateral are A = [0, 3,5], B = (-3,-1,17], C = [4,-3,15] & D = [7, 1,3]. Prove that ABCD is a parallelogram. [5 Marks]
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