A cone needs a three dimensional space in which to exist but it's not a solid, it's a two dimensional surface.
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Same basic shape, except a cone has three dimensions, a triangle has two.
12' To answer this properly more information is needed about the cone. 12' is just one measure, a cone is a 3 dimensional figure.
A cone has two faces.
A cone does not have any sids. A finite cone has two faces.
A cone has one curved edge