What does "semiperimeter" mean?

Half of the perimeter (sum of the lengths of the sides) of a polygon. The term is typically applied to triangles, cyclic quadrilaterals, and regular polygons.

Semiperimeter

noun

noun ·Rare ·Advanced level

Definitions

Noun

1
Half of the perimeter (sum of the lengths of the sides) of a polygon. The term is typically applied to triangles, cyclic quadrilaterals, and regular polygons.

Etymology

From semi- + perimeter.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.