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Vector solution of a ring in equilibrium with three acting forces.

A small ring is held stationary with three forces, A, B and C acting on it.
Force A= 85 nt /20 , Force B= 160 nt /150 . Angles are in degrees relative to the +x axis being 0.
Find the magnitude and direction of Force C.


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Physics statements:
A. The stationary ring is in equilibrium, therefore A+B+C=0
B. For an object in equilibrium, a polygon formed by adding all forces on it must be a closed polygon.
C. A polygon with three sides can be solved by ...