Here, p, q, r and s are the sides of the quadrilateral, T is half the perimeter, and A and C are two opposite angles. Bretschneider's formula works on any quadrilateral regardless of whether it is cyclic or not.
| Graph IRI | Count |
|---|---|
| http://dbkwik.webdatacommons.org | 9 |
![[RDF Data]](/fct/images/sw-rdf-blue.png)
