Q: How many rectangular prisms can you make with only 20 unit cubes?

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Four.

There are only four different configurations.

Ignoring rotations, there are 3 distinct solutions.

4

There are many options: 2 rectangular prisms 2 cubes 2 parallelepipeds 2 tetrahedrons 2 square based pyramids are some possibilities using convex polyhedra.

Related questions

Four.

2 prisms

There are only four different configurations.

Just one, although the orientation of the prism might vary.

Ignoring rotations, there are 3 distinct solutions.

6 i think

93

3

4

The answer depends on the number. Note that the question does not require the solids to be in the form of cubiods (rectangular prisms).

Only one.

You can have the 18 as prisms, OR.. they can be cut up into an infinite number of different prisms, as many as your tools for cutting it can make.