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**massid** I worked this problem through using Fnet = ma. Becuase there is no acceleration and the forces all cancel each other out because there is no displacement, i set Fnet=0. Using forces a and b, i got 0=220+117+b. solved for b and got -337. this was not the right answer. i feel like i have to factor in the angel. but then i feel like i should have an angel for c...which is not given.

In a two-dimensional tug-of-war, Alex, Betty, and Charles pull horizontally on an automobile tire at the angles shown in the picture. The tire remains stationary in spite of the three pulls. Alex pulls with force *F**A* of magnitude 220 N, and Charles pulls with force *F**C* of magnitude 177 N. Note that the direction of *F**C* is not given. What is the minimum magnitude of Betty's force *F**B* ? (Angel of 149 degrees)