Portal:Mathematics/Featured picture/2012 07
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Picture of the month
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/9/98/Tetrahedral_group_2.svg/320px-Tetrahedral_group_2.svg.png)
Credit: Debivort
A tetrahedron can be placed in 12 distinct but equivalent positions by rotation alone. This tetrahedral symmetry is illustrated here in the cycle graph format, along with the 180° edge rotations (blue arrows) and 120° vertex rotations (reddish arrows) that permute the tetrahedron through the positions. The 12 rotations form one symmetry group of the figure.
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