Any 2D figure.
eg: Square, Circle, Rectangle, Octagon, Pentagon, etc.
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A a solid figure on a flat surface is a plane figure (I do believe)
the flat surfaces of a solid figure are the
One of the figure which has no flat surface is Sphere.
a closed, flat figure is a polygon. But it is only a polygon when it is not round.
The flat surface of a solid figure is called a face. For example, a rectangular prism has 6 flat surfaces and therefore 6 faces.