The angle between lines with DRs (1,2,2) and (2,1,2) is:
The angle between lines with DRs (1,2,2) and (2,1,2) is:
- A. 0°
- B. cos⁻¹(8/9)
- C. 45°
- D. 60°
Answer: B) cos⁻¹(8/9)
Explanation: Cosθ=(2+2+4)/(3×3)=8/9. Therefore θ=cos⁻¹(8/9).
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