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One face, the same as a circle. For both a 2D and a 3D oval it's the same. 3D ovals and circles have no vertices or edges. 2D ovals and circles have one edge.
a sphere
Sometimes because a sphere which is a 3d figure has a diameter
A circle is not a 3D figure because it only has two dimensions. A sphere is a 3D "circle".
Yes.