# state parallelogram law of vector addition. show that resultant of two vectors A and B inclined ar an angle theta is R^2=A^2+B^2+2ABcos theta

According to paralleogram low of vector if two vectors acting simultaneously at a point can be represented both in magnitude and direction by the adjacent sides of a parallelogram drawn from a point, then the resultant vector is represented both in magnitude and direction by the diagonal of the parallelogram passing through that point.

Please take A and B instead of P and Q. I have taken P and Q in the place of A and B.

Regards

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