Adjective
isoperimetric (not comparable)
English Wikipedia has an article on:isoperimetricWikipedia
(geometry) Having the same perimeter; applied to the problem of finding a plane figure of the largest possible area whose boundary has a specified length
Isoperimetry further The isoperimetric problem is to determine a figure with the largest area, amongst those having a given perimeter. Source: Internet
The Latin title translates as a method for finding curved lines enjoying properties of maximum or minimum, or solution of isoperimetric problems in the broadest accepted sense. Source: Internet
This is called the isoperimetric theorem for quadrilaterals. Source: Internet