EntityQ15736718· pop 13· linked from 73 articlespencilSign in to savefamily of geometric objects with a common propertyConnectionslineEntitygeometryEntityInternational Standard Book NumberEntitycircleEntityangleEntitydigital object identifierEntityplaneEntitymeridianEntityconic sectionEntityquaternionEntityimaginary numberEntityJSTOREntityimaginary unitEntityscalarEntityparallelismEntityvertexEntitycomplex planeEntityGérard DesarguesEntitylocusEntitycardioidEntityCategoriesAlgebraic geometryProjective geometry