Students model polygrams with pushpins and string, compare rules and algorithms, analyze symmetry properties, and look at the relevance of their polygram in art and architecture.

Protractors
Push-Pins
Straight Pins
Yarn
Simple models are easy to make with pins, yarn, and cardboard, and covering the cardboard with colored paper that contrasts with the yarn makes for nice-looking pieces. Students use a compass and protractor to mark the vertices, getting good practice with these tools.
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