They are shapes that occupy a volume in space. They have a length, width (or breadth) and height.
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The net of a 2 dimensional shape can be folded into a 3 dimensional shape
A cube is a 3 dimensional shape
A 2-dimensional shape is a 'DECAGON'. A 3-dimensional shape is a 'DECAHEDRON'.
Not necessarily, if the 3 dimensional shape is a solid like a chunk of rock (with no cavity or hollow portion) it cannot contain liquid. There needs to be a cavity in the 3 dimensional shape.
3-D Shape