👉 A pseudocone is a special type of cone that can be defined by the equation: \[ x^2 + y^2 = z^2 - 4z \] This equation represents a shape where the vertex angle at the apex (the point where the cone's base meets its apex) lies in the xy-plane, and all other points lie on a plane parallel to the xy-plane. It is often used in computer graphics and parametric modeling. The term pseudocone was introduced by William
