square base pyramid
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Spherical
Cone
A cone perhaps?
Sphere, torus, moebius strip
In order to be 3D it must have a length, a width, and a height. EDIT: Mobius Strip
Its an Cylinder
The shape you are describing is a cylinder. A cylinder has two circular faces, which are also known as bases, and one rectangular face, which is called the lateral face. The lateral face of a cylinder is formed by unrolling the curved surface of the cylinder into a flat shape, creating a rectangle.
A cone?
hemisphere
a cone
cone
A rectangle based pyramid.
A cylinder
A cone, like an ice cream cone.
A cylinder.
cone
That's impossible. A shape has three or more sides/faces. There is NO shape that has one or two sides/faces