Our favorite lesson helps geometry students learn to use diagrams for thinking and communicating (Sinclair, Pimm and Skelin 2012) and motivates a discussion about similarity. The lesson connects sidewalk chalk-andstring (C&S) constructions of regular hexagons with a dynamic geometry software (DGS) approach.

Contributor Notes

Nicole Bannister, nbannis@clemson.edu, is a mathematics educator at Clemson University in Clemson, South Carolina, and advocates for strengths-based framings of teaching and learning in mathematics.

Benjamin J. Sinwell, bsinwell@anderson4.org, teaches mathematics at Pendleton High School in Anderson County, South Carolina. Bannister and Sinwell met at the Park City Mathematics Institute in 2004 and have since collaborated on leadership of summer institutes for PCMI, NCTM, and the Clemson Math Institute. They celebrated their tenth wedding anniversary on July 4 and enjoy traveling with their two daughters, who have birthdays on Christmas and Halloween.

(Corresponding author is Bannister nbannis@clemson.edu)
(Corresponding author is Sinwell bsinwell@anderson4.org)
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