A) \[120{}^\circ \]
B) \[60{}^\circ \]
C) \[90{}^\circ \]
D) \[30{}^\circ \]
Correct Answer: A
Solution :
\[2|\overrightarrow{P}+\overrightarrow{Q}|=|\overrightarrow{P}+2\overrightarrow{Q}|\] \[\Rightarrow \] \[13+12\cos \theta =10+6\cos \theta \] |
\[\cos =-\frac{1}{2}\] |
\[\theta =120{}^\circ .\] |
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