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Magnitudes of vectors vecP, vecQ and vec...

Magnitudes of vectors `vecP, vecQ` and `vecR` are equal, If `vecP + vecQ+vecR =0`, then angle between `vecR and vecQ` is `alpha` while if `vecP + vecQ = vecR`, the angle between `vecR` and `vecP` is `beta`, then :

A

`alpha = 2 beta`

B

`alpha = beta`

C

`alpha = (beta)/(2)`

D

none of these

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The correct Answer is:
A
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