EntityQ2686383· pop 6· linked from 8 articlesright conoidSign in to saveruled surface made of lines orthogonal to an axisConnectionsgeometryEntityfunctionEntitylineEntitythree-dimensional spaceEntityCartesian coordinate systemEntityperpendicularityEntityparaboloidEntityparametric equationEntityhelicoidEntityruled surfaceEntityEncyclopedia of MathematicsEntityEuropean Mathematical SocietyEntityconoidEntityWhitney umbrellaEntityCategoriesGeometric shapesSurfaces