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a cone has circle at bottom
A cone has one side, the bottom surface, but not all cones have this surface. They may also be considered to have 'an inside' and 'an outside', which would be two sides. But as a relative of the circle, a cone has mathematically infinite sides.
An Apex or Vertex of the cone
The curved surface (or face) of the cone.
in math terms cone means a 3 dimensional figure that is round on the tpo and has a flat bottom, like an ice cream cone.