Applied Mechanics and Graphic Statics
For a non-concurrent force system to be in equilibrium

Only the closure of funicular polygon is sufficient
Both force polygon and funicular polygon must close
None of these
Only the closure of force polygon is sufficient

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Applied Mechanics and Graphic Statics
If a set of given forces are such that their free vectors build a closed polygon, then

The resultant force is zero but resultant couple may not be zero
The resultant force is zero but resultant couple is not zero
The resultant force and resultant couple are always zero
The resultant force and resultant couple both may not be zero

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