Question

    If 3 vertices of a parallelogram ABCD are A (1, 2, 3), B (-1, -2, -1) and C (2, 3, 2) (taken in order), then the 4th vertex D is 

    A (4, -7, 6) Correct Answer Incorrect Answer
    B (-4, 7, 6) Correct Answer Incorrect Answer
    C (3, 7, 6) Correct Answer Incorrect Answer
    D (4, 7, 6) Correct Answer Incorrect Answer

    Solution

    Three consecutive vertices of a parallelogram ABCD are A (1, 2, 3), B (– 1, – 2, – 1) & C (2, 3, 2) Let the forth vertex be D(x,y,z).  D (4, 7, 6) 

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