Illuminations: Pinwheel

Each student creates parallelograms from square sheets of paper and connects them to form an octagon.

During the construction, students consider angle measures, segment lengths, and areas in terms of the original square. At the end of the lesson, the octagon is transformed into a pinwheel, and students discover a surprising result.

 

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Geometry
Middle School, High School, Educator

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Illuminations (National Council of Teachers of Mathematics)

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