# From the Tether Problem to the Involute of a Circle

From the Tether Problem to the Involute of a Circle

A cow is tethered at the point to a black building of semiperimeter . The figure represents half of the area it can graze with a leash equal to . Change the angle to see what happens as the cow moves around the building. The shape of the base of the building can be either a regular polygon or a circle. If you choose a polygon, use the slider to increase the number of sides.

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