EntityQ1370316· pop 21· linked from 8 articlesCasey’s theoremSign in to savetheoremConnectionsmathematicsEntityPythagorean theoremEntitymathematicianEntityquadrilateralEntityEuclidean geometryEntitylaw of sinesEntitylaw of cosinesEntityJSTOROrganizationPtolemy's theoremEntityMathWorldEntityEric W. WeissteinEntityGerman Mathematical SocietyEntityJohn CaseyEntityFeuerbach pointEntityBitangentEntityCategoriesEuclidean geometryTheorems about circles