Editing Semiperimeter (section)

{{Short description|Half of the sum of side lengths of a polygon}}
In [[geometry]], the '''semiperimeter''' of a [[polygon]] is half its [[perimeter]]. Although it has such a simple derivation from the perimeter, the semiperimeter appears frequently enough in formulas for [[triangles]] and other figures that it is given a separate name. When the semiperimeter occurs as part of a formula, it is typically denoted by the letter {{mvar|s}}.