🌐EnglishEnglishDeutschEspañolFrançaisPortuguêsTürkçeРусский日本語EntityQ18630480· pop 13· linked from 4 articlesEuler's quadrilateral theoremAlso known as Euler's law on quadrilateralsAvailable in 12 languagesEspañolFrançaisDeutsch日本語РусскийPortuguêsGreekKazakhConnectionsLeonhard EulerEntityInternational Standard Book NumberEntityCategoriesEuclidean geometryTheorems about quadrilaterals