Mathematics · Vector Algebra
Two adjacent sides of a parallelogram ABCD are given by vector AB = 2î + 10ĵ + 11k̂ and vector AD = -î + 2ĵ + 2k̂. The side AD is rotated by an angle α in the plane of the parallelogram so that AD becomes AD'. If AD' makes a right angle with the side AB, then the cosine of the angle α is given by:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 14√59✓
- 2√179
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Correct answer
4√59
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