A) 169
B) 19
C) 13
D) 144
E) 16
Correct Answer: C
Solution :
\[\because \]Projection of\[\overset{\to }{\mathop{PQ}}\,\]on OX, OY, OZ are 12,3 and 4 respectively, then\[\overset{\to }{\mathop{PQ}}\,=12\hat{i}+3\hat{j}+4\hat{k}\] \[\therefore \] \[|\overset{\to }{\mathop{PQ}}\,|=\sqrt{{{12}^{2}}+{{3}^{2}}+{{4}^{2}}}=\sqrt{169}\] \[=13\]You need to login to perform this action.
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