EntityQ1980541· pop 8· linked from 5 articlesJacobi's theoremSign in to saveplane geometry theorem by Karl Friedrich Andreas JacobiConnectionsgeometryEntitytriangleEntityInternational Standard Book NumberEntityWayback MachineEntityplaneEntityEuclidean geometryEntityhyperbolaEntitybarycentric coordinate systemEntitytriangle centerEntityFermat pointEntityconcurrent linesEntityNapoleon pointsEntityForum GeometricorumEntityCategoriesTheorems about triangles