Parsing the Parallelogram

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This article shows how to calculate the amount and direction of the resultant force from two different loads on a point using just a straightedge and a pair of dividers.

Description

This article shows how to calculate the amount and direction of the resultant force from two different loads on a point using just a straightedge and a pair of dividers. This is an ancient application of graphic, non-algebraic geometry to a problem commonly encountered in the rigging of sailboats.  It is also useful in resolving the load forces presenting in carpentry and furniture structures.