If P .Q = PQ, then angle between Pand Q is

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If $\overrightarrow P .\overrightarrow Q = PQ,$ then angle between $\overrightarrow P $and $\overrightarrow Q $ is ....... $^o$

$0$

$30$

$45$

$60$

If $\overrightarrow P .\overrightarrow Q = PQ,$ then angle between $\overrightarrow P $and $\overrightarrow Q $ is ....... $^o$

$\cos \theta = \frac{{\vec P.\vec Q}}{{PQ}} = 1$

$\theta = 0^\circ $

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