3-d

Question: If the co-ordinates of the points $P,\,Q,R,\,S$ be (1, 2, 3), (4, 5, 7), (– 4, 3, – 6) and (2, 0, 2) respectively, then



1) $PQ||RS$
2) $PQ\,\bot \,RS$
3) $PQ=RS$
4) None of these
Solution: Explanation: No Explanation
System of co-ordinates Direction cosines and direction ratios Projection

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