It is its volume or capacity.
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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.
The net of a 2 dimensional shape can be folded into a 3 dimensional shape
It is the amount of three dimensional space occupied by a 3-d shape.
A cube is a 3 dimensional shape
A 2-dimensional shape is a 'DECAGON'. A 3-dimensional shape is a 'DECAHEDRON'.