EntityQ644719· pop 20· linked from 85 articleshalf-spaceSign in to saveportion of a Euclidean space bisected by a hyperplaneConnectionslineEntitygeometryEntityInternational Standard Book NumberEntitysphereEntityspaceEntityplaneEntitylinear equationEntitypolyhedronEntityinequalityEntityOCLC, Inc.EntityEuclidean spaceEntitytwo-dimensional spaceEntityconvex setEntityopen setEntitypartition of a setEntityMathWorldEntityMerriam-WebsterEntityhyperplaneEntityEric W. WeissteinEntityEncyclopedia of MathematicsEntityCategoriesEuclidean geometry