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If forces of magnitudes P, Q and R act a...

If forces of magnitudes P, Q and R act at a point parallel to the sides BC, CA and AB respectively of a triangle ABC, the magnitude of their resultant is

A

`sqrt""(P^(2) + Q^(2) + R^(2))`

B

`sqrt""(P^(2) + Q^(2) +R^(2)-2QR cos A- 2RP cos B- 2PQ cos C)`

C

`P+Q+R`

D

none

Text Solution

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The correct Answer is:
B
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