*Geometry Labs*) is definitely among my most popular for middle school, or for Day 1 of a Geometry course. I have heard of its use in many classrooms.

Here is a photo from a lesson on symmetry in my Space course, a few years ago:

Student-created dodecagon: 3-fold rotational symmetry, no mirrors |

Extend the pattern, making sure the four given lines are lines of symmetry for the (infinite) tiling you generate. |

--Henri

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