It has three dimensions: length, height, and width
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triangular pyramid
A circle is not a 3D figure because it only has two dimensions. A sphere is a 3D "circle".
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.
A cylinder.
A cube is a good example of a 3D figure when drawn on paper and showing perspective.