# Ptolemy's theorem

> theorem

**Wikidata**: [Q459547](https://www.wikidata.org/wiki/Q459547)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Ptolemy's_theorem)  
**Source**: https://4ort.xyz/entity/ptolemy-s-theorem


## References

1. Freebase Data Dumps. 2013