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A cone needs a three dimensional space in which to exist but it's not a solid, it's a two dimensional surface.
An oval is two-dimensional. An ovoid is a three-dimensional shape based on an oval - like an egg,
Two three dimensional figures that have circular bases: Cone, and Cylinder.
It is a polyhedron.
It is pi x cone radius x square root ( radius squared + height squared) I think you mean three dimensional cone, no such thing as a two diensional cone