Two - one circumferential which when developed will give a sector-like form
the other is the circular base
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A cone has either one or two surfaces and either one or no edges.
ther is 20 surfaces on a cone because the is 1 on it sharp part * * * * * In fact, one flat surface (and one curved one).
The flat and the curved surfaces. In ice cream cone terms the ice cream and the cone are the two surfaces. Even if you eat the ice cream and the cone gets empty there are 2 surfaces, the inside and the outside curved surfaces.
Two: inside and outside.
a cone has one flat surface one vertex and no edge.