If vectors $P, Q$ and $R$ have magnitude $5, 12$ and $13 $ units and $\overrightarrow P + \overrightarrow Q = \overrightarrow R ,$ the angle between $Q$ and $R$ is
If vectors $P, Q$ and $R$ have magnitude $5, 12$ and $13 $ units and $\overrightarrow P + \overrightarrow Q = \overrightarrow R ,$ the angle between $Q$ and $R$ is
- A
${\cos ^{ - 1}}\frac{5}{{12}}$
- B
${\cos ^{ - 1}}\frac{5}{{13}}$
- C
${\cos ^{ - 1}}\frac{{12}}{{13}}$
- D
${\cos ^{ - 1}}\frac{7}{{13}}$
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