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    • Thread Starter

    How do I solve this question? I'm a lil' stuck >.<

    Points A,B and C have position vectors a=(2,1,2) b=(-3,2,5) c=(4,5,2) respectively , with respect to a fixed origin. The point D is such as ABCD, in that order is a parallelogram. Find the position of vector D.

    Can someone explain the way to solve this please ^^

    You know that to be a parallelogram, AB and CD are opposite sides with the same length, and because they are parallel are given by the same vector. So work out AB and deduce what D must be so that CD produces the same vector :yes:
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