If they have varying heights and widths and lengths.
For example:
You have a cube and a rectangular prism.
The cube has sides that are all 6 cm. long. That cube has a volume of 216 cm Squared.
The rectangle has the dimensions 3 by 12 by 6. This rectangular prism has a volume of 216 cm squared, just like the cube, and even though they weren't the same figure, they has the same volume.
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Figures in three dimensions are known as solids.
Polygons are 2-dimensional so that they only have length and breadth. Solid figures are three dimensional so they have length, breadth and height.
Two three dimensional figures that have circular bases: Cone, and Cylinder.
Solids have three dimensions.Two-dimensional figures have length and width, and you can use these to calculate the area.Three-dimensional figures (i.e., solids) have length, width, and depth, and you can use these to calculate the volume.
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.