3-d

Question: The co-ordinates of points $A,B,C,D$are (a, 2, 1), (1, –1, 1), (2, – 3, 4) and (a+1, a+2, a+3) respectively. If $AB=5$and $CD=6$, then $a=$



1) 2
2) 3
3) – 2
4) – 3
Solution: Explanation: No Explanation
System of co-ordinates Direction cosines and direction ratios Projection

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