# Pentagramma mirificum

> a star polygon on a sphere, composed of five great circle arcs, whose all internal angles are right angles.

**Wikidata**: [Q60170081](https://www.wikidata.org/wiki/Q60170081)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Pentagramma_mirificum)  
**Source**: https://4ort.xyz/entity/pentagramma-mirificum