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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