(A) three forces acting at a point will be in equilibrium
(B) three forces acting at a point can be represented by a triangle, each side being proportional to force
(C) if three forces acting upon a patticle are represented in magnitude and direction by the sides of a triangle, taken in order, they will be in equilibrium
(D) if three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two
(E) none of the above
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