The base of a cone is a circle, and circle have an infinite amount of sides
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a cone has one base and a circular top... therefore it has 2 sides and one corner
If you're asking "How many surfaces are there on a 3-dimensional cone? then the answer is 2: The first surface is the circular base. The 2nd is the actual "cone" part that wraps around to a point above the circle.
a pyramid and a cone are alike because they both have a flat side on the bottom and they can slide. they are different because a pyramid has 5 flat sides on the sides and 1 flat side on the bottom part. a cone can roll but a pyramid can't roll like the cone.
#1 a cone is 3d and a rectangle is 2d. #2 a cone has a circular base and a ractangle has 4 sides that only 2 are parralel
Start with a regular tetrahedron (triangular based pyramid). As you increase the number of sides in the base of the pyramid, the shape becomes more and more like a right cone. In the limit, the base tends to a polygon with an infinite number of sides - a circle, and the pyramid tends to a right cone.