Calculate an Arena

Calculator for the perimeter and size of an arena or stadium with different units. An arena has the shape of a bisected circle, where between the two semicircles a matching rectangle in inserted. Please enter length and width of the arena and choose the units. The length must be larger than the width. Perimeter and area will be calculated.

Length:		cmdmmkminftydmi
Width:		cmdmmkminftydmi
Perimeter:		cmdmmkminftydmi
Area:		cm²dm²m²km²ahasq insq ftsq ydacsq mi

Units of measurement: cm=centimeter, dm=decimeter, m=meter, km=kilometer, in=inch, ft=foot, yd=yard, mi=mile, ²,sq=square, a=are, ha=hectare, ac=acre

Formulas:

Length l, width w
Perimeter p = πw + 2(l-w)
Area A = πw²/4 + w(l-w)

An arena or stadium shaped field.

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