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isoperimeter

[ahy-soh-puh-rim-i-ter]
noun Geometry.
  1. a figure whose perimeter is equal to that of another.
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Origin of isoperimeter

First recorded in 1665–75; iso- + perimeter
Also called isoperimetric figure.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018