Annulus approximations

Autor:David Taub

This activity allows you to explore the accuracy of a common method for approximating the area of an annulus. Can you figure out where the method comes from? When is it a good enough approximation?

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Rose Curve
Pathway to Proof: Triangle Angles
Fourier Lissajous (Mechanical)

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ondulations
Circles - intersecting chords and secants
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Linear combinations and convex linear combinations
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