A cylinder, a frustum, a sphere with two slices cut off, a torus (doughnut) with a wedge removed are some examples.
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They are called a Vertices and it is where 2 edges meet.
The question is ambiguous. An octagon is a 2-dimensional shape with 8 edges and 8 vertices. Does a 3-D octagonal shape mean one with 8 edges or 8 faces or vertices, or faces which are 2d octagons?
Well, honey, that sounds like a hexagonal prism to me. It's got those six faces, six vertices, and ten edges, making it the life of the 3D shape party. So, go ahead and strut your stuff with that hexagonal prism knowledge!
There can be no such shape.
a cylinder l