precal
posted by sarah .
Three forces with magnitudxes 100, 50 and 80 lbs act on an object at angles of 50 degree, 160 degree and 20 degree respectively.

I assume you want the resultant force? Just convert the polar coordinates to rectangular, add them, and convert back to polar:
(100,50°) = (64.28,76.60)
(50,160°) = (46.98,17.10)
(80,20°) = (75.18,27.36)
add them to get
(92.48,66.34) = (113.81,35.65°)
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