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  4. If P.Q = PQ then angle between P and Q

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Q. If $\overrightarrow{P}.\overrightarrow{Q}$ = PQ then angle between $\overrightarrow{P}$ and $ \overrightarrow{Q }$

Motion in a Plane

Solution:

$\overrightarrow {P} . \overrightarrow {Q} $ = PQ cos $\theta$ = PQ . Hence, cos $\theta$ = 1 .Which given $\theta = 0^0$