Dissection of Square into 9 Acute Triangles

Theorem

A square can be dissected into $9$ acute triangles.


Construction

Let $\Box ABCD$ be a square.




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Proof


This theorem requires a proof.
In particular: Trivial but wordy and tedious.
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Sources

  • 1991: David Wells: Curious and Interesting Geometry ... (previous) ... (next): acute-angled triangle dissections
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