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Two adjacent sides of a parallelogram ABCD are given by ˆˆˆ21011=++ABijk and ˆˆˆ22=-++ADijk. The side AD is rotated by an acute angle a 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 a is given by??

Two adjacent sides of a parallelogram ABCD are given by ˆˆˆ21011=++ABijk and ˆˆˆ22=-++ADijk. The side AD is rotated by an acute angle a 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 a is given by??

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1 Answers

Saurabh Koranglekar
askIITians Faculty 10335 Points
2 years ago
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