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A Carpenter's Rule of Thumb

by Robert Fakler (University of Michigan-Dearborn)

This article originally appeared in:
Mathematics Magazine
April, 2005

Subject classification(s): Measurement | Plane Geometry | Geometry and Topology
Applicable Course(s): 4.9 Geometry

A discrepancy in a method popular with carpenters to check a rectangle for squareness is discussed.

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