If the direction ratios of a line are 1, −2, 2, then its direction cosines are:
If the direction ratios of a line are 1, −2, 2, then its direction cosines are:
- A. (1/3, −2/3, 2/3)
- B. (1/2, −1, 1)
- C. (1/9, −2/9, 2/9)
- D. (1/√5, −2/√5, 2/√5)
Answer: A) (1/3, −2/3, 2/3)
Explanation: Magnitude = √(1+4+4)=3. Dividing each DR by 3 gives direction cosines (1/3, −2/3, 2/3).
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