imo class 12 three dimensional geometry

If two lines have proportional direction ratios, then the angle between them is:

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If two lines have proportional direction ratios, then the angle between them is:

  • A. 90°
  • B. 45°
  • C. 0°
  • D. 60°

Answer: C) 0°

Explanation: Proportional DRs mean the direction vectors are parallel. Hence, the angle is 0°.

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