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A New Proof of the Double Butterfly Theorem

by Larry Hoehn (Austin Peay State University)

This article originally appeared in:
Mathematics Magazine
October, 1990

Subject classification(s): Circles | Plane Geometry | Geometry and Topology
Applicable Course(s): 4.10 Math for High School Teachers | 4.9 Geometry

Using Haruki's lemma, the author provides an easy proof of the Double Butterfly Theorem in plane geometry regarding a circle and its chords.

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