Tube

A tube is a two-dimensional surface constructed by creating a prism with a hollow circle as the base. It can also be considered as a two-dimensional version of the torusconstructed by stretching a line segment in a ring.
Another way to construct it topologically is to take a sphere and then remove two disjoint open discs.
A tube can also be embedded in a two dimensional plane. This less symmetric embedding is called an annulus.
==Structure and Sections==
===Hypervolumes===
*edge length = 
*surface area = 
===Subafects===
*2 circles (1D)
*1 tube (2D)
Category:Shapes
Category:List of 3rd dimension