Applied Mechanics and Graphic Statics
The member forces in a statically in determinate truss

Cannot be obtained by graphic statics
Can be obtained by graphic statics by trial and error
May be obtained by graphic statics
Can be obtained by graphic statics

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

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