A cone.
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cone
rectangle, cylinder
2, if you're talking about a round table (the top and bottom) but if you're talking about a rectangular/square table then there's 6 (top, bottom, then the 4 sides
The top is rounded in a way and the bottom is flat. This makes lift. That is how a plane stays up in the air.
A frustum is a truncated cone or pyramid. In other words, a cone with the top cut off, much like an ice cream cone with a flat bottom.