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Three Dimensional Geometry
Oswaal
CBSE
Grade 12

Question:

If line has direction ratios $2, -1, -2$, its direction cosines are:
(a) $2/3, -1/3, -2/3$
(b) $2, -1, -2$
(c) $1/3, -1/3, -2/3$
(d) $2/9, -1/9, -2/9$

Step-by-Step Solution

Key Concept: Magnitude = \sqrt{4+1+4} = 3.
The detailed step-by-step mathematical proof is available inside the Mathbee app workspace.
Correct Answer: $2/3, -1/3, -2/3$
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