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Moving Squares

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If this shows a quarter of the cylinder from above, what do you know about the angles?
What is the significance of the black and white sections at the bottom of the image?
bird's eye view of cylinder

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The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to embed rich mathematical tasks into everyday classroom practice.

NRICH is part of the family of activities in the Millennium Mathematics Project.

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