# The rotations of the tetrahedron

The green straw, laid between the two mirrors that form an angle of 90°, shows the 3 rotation axes of order 2 in a regular tetrahedron (the lines that go through the midpoints of two opposite edges); the blue straw, laid between the mirrors that form an angle of 60°, shows the 4 rotation axes of order 3 (the lines that go through a vertex and the centre of the opposite face).

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The image belongs to the sections...:

The symmetry group of the tetrahedron
(*332) (Symmetry)

In the yellow kaleidoscope (tetrahedron) (From the exhibitions of matematita)

Tetrahedron (3D geometry)

Further information:

http://specchi.mat.unimi.it