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A Property of Quadrilaterals

by Joseph B. Dence (University of Missouri, St. Louis) and Thomas P. Dence (Ashland University)

This article originally appeared in:
College Mathematics Journal
September, 2001

Subject classification(s): Geometry and Topology | Geometric Proof
Applicable Course(s): 4.9 Geometry

Uses a result of Euler to obtain a formula to measure a quadrilateral's departure from a parallelogram

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