# Talk:Dehn invariant

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Mathematics rating:
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Field:  Geometry

## More examples please - tetrahedron

So what is the Dehn invariant of a regular tetrahedron ? Can we show it as a vector or tensor ? - Rod57 (talk) 10:40, 8 November 2017 (UTC)

${\displaystyle 6\ell \otimes \arccos {\tfrac {1}{3}}}$, where ${\displaystyle \ell }$ is the edge length. —David Eppstein (talk) 18:19, 8 November 2017 (UTC)

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