If $\overrightarrow P .\overrightarrow Q = PQ,$ then angle between $\overrightarrow P $and $\overrightarrow Q $ is ....... $^o$
If $\overrightarrow P .\overrightarrow Q = PQ,$ then angle between $\overrightarrow P $and $\overrightarrow Q $ is ....... $^o$
- [AIIMS 1999]
- A
$0$
- B
$30$
- C
$45$
- D
$60$
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- [AIPMT 1991]
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