ther is 20 surfaces on a cone because the is 1 on it sharp part
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In fact, one flat surface (and one curved one).
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a cone has one flat surface one vertex and no edge.
If you consider a cylinder, it has two faces, of you consider a cone instead, it has one face ONLY.
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.
A cone and a cylinder are two of them
A Cube..