Classroom Action: Explore Rotation with Compass, Straightedge

Today I had my kids work on this little exploration as a fun way to keep up their compass & straightedge skills.  The one question this exploration is lacking is the final generalization:  WHY does this work?  (Hint: the perpendicular bisector theorem…)

And then when I checked out Sam J. Shah’s blog, I found out he’s interested in the same thing: Discovering the center of a rotation.

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