Class 12 Three Dimensional Geometry · Mcq Single Correct1 Marksorthogonal_directions
Class 12 Maths · Three Dimensional Geometry · Mcq Single Correct #14
Lines x=ay+b,z=cy+d and x=a′y+b′,z=c′y+d′ have orthogonal directions if and only if:
✅ Step-by-Step Solution
Final Answer: Option (A): aa′+cc′+1=0
- Their direction vectors are (a,1,c),(a′,1,c′). Set their dot product to zero.
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