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Stadium (geometry)
Geometric shape of rectangle and two semicircles / From Wikipedia, the free encyclopedia
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A stadium is a two-dimensional geometric shape constructed of a rectangle with semicircles at a pair of opposite sides.[1] The same shape is known also as a pill shape,[2] discorectangle,[3] obround,[4][5] or sausage body.[6]
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/c/c8/Stadium_geometry.svg/110px-Stadium_geometry.svg.png)
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The shape is based on a stadium, a place used for athletics and horse racing tracks.
A stadium may be constructed as the Minkowski sum of a disk and a line segment.[6] Alternatively, it is the neighborhood of points within a given distance from a line segment. A stadium is a type of oval. However, unlike some other ovals such as the ellipses, it is not an algebraic curve because different parts of its boundary are defined by different equations.