Mathematics · Vector Algebra
Two adjacent sides of a parallelogram ABCD are given by vector AB = 2i + 10j + 11k and vector AD = -i + 2j + 2k. The side AD is rotated by an acute angle α in the plane of the parallelogram so that AD becomes AD'. If AD' makes a right angle with side AB, then the cosine of the angle α is given by:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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√17/9
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