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Two Wheel Belt
A classic trigonometry problem asks for the length of a belt wrapped around two wheels. The radii of the two wheels are and . The wheels are units apart.
Let A and C be the two arcs of the belt and let B be one of the two segments joining the ends of the arcs. B is an exterior tangent to both circles. Then the lengths of A, B, and C are and .




"Two Wheel Belt" from The Wolfram Demonstrations Project
 http://demonstrations.wolfram.com/TwoWheelBelt/
Contributed by: Ed Pegg Jr
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