Applied Mechanics and Graphic Statics
A system of coplanar forces is in equilibrium when

All the forces are concurrent
Both force polygon" and funicular polygon close
Force polygon closes
Funicular polygon closes

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Applied Mechanics and Graphic Statics
Free body diagram is an

Isolated joint with only body forces acting on it
Isolated joint with internal forces acting on it
Isolated joint with all the forces, internal as well as external, acting on it
None of these

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