Roger C Alperin, A Grand Tour of Pedals of Conics,
Forum Geometricorum, 4 (2004) 143--151.

Abstract: We describe the pedal curves of conics and some of their relations to origami folding axioms. There are nine basic types of pedals depending on the location of  the pedal point with respect to the conic. We illustrate the different pedals in our tour.

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