That depends:
* On the size of the 3D object
* On the size of the cubes
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They are cubes
Well, a 2D object has only length and width, but a 3D object has length, width, and depth.
Paper is a 3D object.
cubes and rectangular prisms
3D means that they have three dimensions, which are height, width and depth. 3D figures are solid shapes such as cubes and spheres, rather than their 2D equivalents which would be squares and circles.