Applied Mechanics and Graphic Statics
Parallelogram Law of Forces states, "if two forces acting simultaneously on a particle be represented in magnitude and direction by two adjacent sides of a parallelogram, their resultant may be represented in magnitude and direction by

Its shorter side
The diagonal of the parallelogram which does not pass through the point of intersection of the forces
Its longer side
The diagonal of the parallelogram which passes through the point of intersection of the forces

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Applied Mechanics and Graphic Statics
Free body diagram is an

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

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