# 3 Configurations of 9 Lines with 3 Intersection Points on each Line

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## Theorem

There exist exactly $3$ essentially different configurations of $9$ straight lines each of which has exactly $3$ points of intersection.

This is one: there are two others.

## Proof

This theorem requires a proof.In particular: The precise meaning of the term "essentially different" needs to be established, for a startYou can help $\mathsf{Pr} \infty \mathsf{fWiki}$ by crafting such a proof.To discuss this page in more detail, feel free to use the talk page.When this work has been completed, you may remove this instance of `{{ProofWanted}}` from the code.If you would welcome a second opinion as to whether your work is correct, add a call to `{{Proofread}}` the page. |

## Also see

## Sources

- 1986: David Wells:
*Curious and Interesting Numbers*... (previous) ... (next): $9$ - 1997: David Wells:
*Curious and Interesting Numbers*(2nd ed.) ... (previous) ... (next): $9$