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 Stadium (geometry) ： ウィキペディア英語版

A stadium is a two-dimensional geometric shape constructed of a rectangle with semicircles at a pair of opposite sides. Alternative names include discorectangle and obround.〔http://www.vista-industrial.com/obround.php〕〔http://www.ljstar.com/Products/industrial-sight-glass-obround-level-gauges〕〔http://www.phelpsweb.com/phel1_16.htm〕〔http://www.turnertanks.com/HorizontalObround.html〕
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 $P = 2 \left(\pi r+a\right)$ and the area by $A = \pi r^2 + 2ra = r\left(\pi r + 2a\right),$ where ''a'' is the length of the straight sides and ''r'' is the radius of the semicircles.〔(【引用サイトリンク】title=Stadium Calculator )