Question

融融

沒給角度要怎麼算啊?

Force R is the resultant of two forces P and Q. If the magnitudes of R and Q are
15 N and 7.32 N, respectively, determine
(a) the magnitude of P; (9.93 N or 17.25 N)
(b) the projection of R onto the direction of P. (13.6 N)
B
P
0
a
R