Stadium (geometry)
A stadium is a two-dimensional geometric shape constructed of a rectangle with semicircles at a pair of opposite sides.[1] Alternative names include discorectangle[2] and obround.[3][4]
A capsule is produced by revolving a stadium around the line of symmetry that bisects the semicircles.
The shape is used for athletics and horse racing tracks.
Formulas
The perimeter of a stadium is calculated by the formula 
and the area by 
where a is the length of the straight sides and r is the radius of the semicircles.[5]
See also
References
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