Class 12 Three Dimensional Geometry · Mcq Single Correct1 Marksorthogonal_directions
Class 12 Maths · Three Dimensional Geometry · Mcq Single Correct #64
Find k for which directions (1,1,−k) and (k,2,−2) are orthogonal.
✅ Step-by-Step Solution
Final Answer: Option (A): −2/3
- Their dot product is k+2+2k=3k+2=0, so k=−2/3.
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