You are here

A Butterfly Theorem for Quadrilaterals

by Sidney Kung (University of North Florida)

This article originally appeared in:
Mathematics Magazine
October, 2005

Subject classification(s): Patterns | Plane Geometry | Geometry and Topology
Applicable Course(s):

The Butterfly Theorem states, "Through the midpoint I of a chord AC of a circle, two other chords EF and HG are drawn. If EG and HF intersect AC at M and N, respectively, then IM = IN."

A pdf copy of the article can be viewed by clicking below. Since the copy is a faithful reproduction of the actual journal pages, the article may not begin at the top of the first page.

To open this file please click here.

These pdf files are furnished by JSTOR.

Classroom Capsules would not be possible without the contribution of JSTOR.

JSTOR provides online access to pdf copies of 512 journals, including all three print journals of the Mathematical Association of America: The American Mathematical Monthly, College Mathematics Journal, and Mathematics Magazine. We are grateful for JSTOR's cooperation in providing the pdf pages that we are using for Classroom Capsules.

Capsule Course Topic(s):
Average: 3 (5 votes)