## Quick Reference

A triangle constructed so that each of its sides represents one of three coplanar vectors acting at a point with no resultant. If the triangle is completed, with the sides representing the vectors in both magnitude and direction, so that there are no gaps between the sides, then the vectors are in equilibrium. If the three vectors are forces, the figure is called a **triangle of forces**; if they are velocities, it is a **triangle of velocities**.

*Subjects:*
Physics.

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