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funicular polygon[fə′nik·yə·lər ′päl·ə‚gän]
a graphical method of finding the reactive forces and resultants of a system of forces, constructing bending-moment diagrams, determining the rational shapes of arched and suspended systems, and solving other problems of the statics of two-dimensional systems.
The construction of funicular polygons is based on the conception of a polygon formed by an axis that is fixed at the ends of a weightless thread (string), which is tensioned by the forces acting on it. The construction of a funicular polygon together with a force polygon (see Figure 1) is also used to determine the geometric characteristics of planar cross sections and to solve certain problems in engineering hydraulics, economics, and other fields.