Go back to you original definition of vector addition by the parallelogram law.
Start by drawing vector P.
From the same origin O, draw vector R the same length and at right angles to P.
This will be the diagonal resultant of your parallelogram.
Join the ends of the vectors R and P, noting the angle alpha as shown.
Complete the parallelogram by drawing the vector OQ parallel to RP.
Thus you can find the angle required by simple geometry.
I will leave it to ChipB use these diagrams to explain what he means by components if he wants.
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Last edited by studiot; Jul 13th 2018 at 04:18 PM.
Reason: spelling
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