Q36 of 36 Page 10

Find x such that the four points A (4, 4, 4), B (5, x, 8),

C (5, 4, 1) and D (7, 7, 2) are coplanar.[CBSE 2018]




As, are coplanar so volume of ABCD = 0





Hence for A,B,C,D to be coplanar x = 7.

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