ANSWERS: 4

Yes. It's called a hexagon, because it has six sides. Hexa=six. Gon=sides. Hexa + Gon= hexagon= a six sided shape.

A Venturi is nearly the opposite.

i guess there is no proper name i know of, but the formula would be the (maximum of the function to be rotated  the function itsself). This would give you the shape.

pair of cones?
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