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

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

ANSWER DOWNLOAD EXAMIANS APP

Applied Mechanics and Graphic Statics
Varingon’s theorem of moment’s states

Algebraic sum of the moments of the forces about any point in their plane, is equal to the moment of their resultant about that point
Algebraic sum of the moments of two forces about any point, is equal to the moment of their resultant about that point
Arithmetical sum of the moments of two forces about any point, is equal to the moments of their resultant about that point
Arithmetical sum of the moments of the forces about any point in their plane, is equal to the moment of their resultant about that point

ANSWER DOWNLOAD EXAMIANS APP