3-d

Question: If the co-ordinates of the points P and Q be (1, –2, 1) and (2, 3, 4) and O be the origin, then



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

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