# Theorem of the gnomon

> certain parallelograms occurring in a gnomon have areas of equal size

**Wikidata**: [Q61163749](https://www.wikidata.org/wiki/Q61163749)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Theorem_of_the_gnomon)  
**Source**: https://4ort.xyz/entity/theorem-of-the-gnomon