EntityQ23034996· pop 5· linked from 3 articlesNine-point conicSign in to savegeometric curve associated with a quadrangleConnectionsgeometryEntityWayback MachineEntityellipseEntityUniversity of California, BerkeleyEntityconic sectionEntityhyperbolaEntityJSTOROrganizationnine-point circleEntityMathWorldEntityUniversity of BathEntitymidpointEntityTaylor & FrancisEntityorthocenterEntityAnnals of MathematicsEntityMaxime BôcherEntityHathiTrust Digital LibraryEntitycomplete quadrangleEntityEdinburgh Mathematical SocietyEntitycircumscribed circle for triangleEntityCategoriesEuclidean plane geometryProjective geometry