Rectangle.
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Ring-like.In Geometry it could possibly be a torus (plural tori).
A one-sided shape is called a "monogon," which is a theoretical concept representing a shape with one side and one vertex. A two-sided shape is called a "digon," which is also a theoretical concept representing a shape with two sides and two vertices. In geometry, these shapes are considered degenerate cases and do not exist in the physical world.
Oh, what a lovely question! A shape with 1,000,001 sides is called a chiliagon. Just imagine all the happy little angles and lines that come together to create such a unique and special shape. Remember, there are no mistakes in geometry, just happy little discoveries.
It is called an angle!
In geometry, the only shape that has one surface is a plane.