# 3 Non-Parallel Planes divide Space into 8

From ProofWiki

## Theorem

Let $3$ planes which are pairwise non-parallel be constructed in ordinary $3$-dimensional space.

Then that space is divided into $8$ parts by those planes.

## Proof

## Sources

- 1997: David Wells:
*Curious and Interesting Numbers*(2nd ed.) ... (previous) ... (next): $8$