*Geometry Labs*8.6 or

*Algebra: Themes, Tools, Concepts*4.12.) I have used this in the classroom for decades, because it is such a beautiful and surprising result, which provides a wonderful connection between algebra and geometry, and because it is both accessible and challenging in just the right way. But it's only three years ago, at a meeting of Escape from the Textbook! that I started to understand the underlying math.

Many thanks to Kim Seashore, Avery Pickford, and Dan Bennett for their help with this!

--Henri

For more lattice / geoboard math on this blog, click here.

On my Web site: follow the links at the bottom of the new page.

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