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A flat surface with two dimensional shape.
Something that is not flat. A cube is three-dimensional, but a square is not. A sphere is three-dimensional, but a circle is not.
Plane figures are flat (2-dimensional) shapes.
It is a polyhedron.
a two dimensional figure is flat. it only has length and width. three dimensional figures have length, width and height. A square is a 2 dimensional figure, but a cube is a 3 dimensional figure.