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NDA 2011
Exam
NDA
Year
2011
Subject
Mathematics
Chapter
Three Dimensional Geometry

NDA 2011 · Mathematics · Three Dimensional Geometry

What is the angle between the lines whose direction cosines are...

What is the angle between the lines whose direction cosines are proportional to (2,3,4)(2,3,4) and (1,−2,1)(1,-2,1) respectively?

Options

  1. A90∘90^{{}^{\circ}}
  2. B60∘60^{{}^{\circ}}
  3. C45∘45^{{}^{\circ}}
  4. D30∘30^{{}^{\circ}}

Correct answer

A. 90∘90^{{}^{\circ}}

Step-by-step solution

The correct answer is option (A).
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