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pedal curve[′ped·əl ‚kərv]
(or pedal). The locus P of the feet of the perpendiculars dropped from a point O to the tangents of a given curve A is called the pedal curve of A with respect to the point 0. An example of a pedal curve is given in Figure 1. The curve A is said to be the first negative pedal curve of P with respect to the point 0.