Posted by sarah on Tuesday, January 8, 2013 at 11:17pm.
Three forces with magnitudxes 100, 50 and 80 lbs act on an object at angles of 50 degree, 160 degree and 20 degree respectively.

precal  Steve, Wednesday, January 9, 2013 at 10:36am
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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