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.
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A cone has one edge. An edge is basically a line. Go to mathforum.com to check the answer. I think that's what the website's called...
The side of a cone is - not surprisingly - conical is shape. Its net is a sector of a circle.
The curved surface (or face) of the cone.
Triangle
Tilt of cutting plane is between (perpendicular to axis of the cone) and (parallel to the side of the cone).
A cone has one side. (The bottom) Because the other surface is curved, it does not count as a side. It is the same concept as a sphere.