imo class 12 three dimensional geometry

A line has DCs (1/√2, 1/√2, 0). The angle with z-axis is:

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A line has DCs (1/√2, 1/√2, 0). The angle with z-axis is:

  • A.
  • B. 45°
  • C. 60°
  • D. 90°

Answer: D) 90°

Explanation: Direction cosine with z-axis is 0, hence angle=90°.

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