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Enneagonal dihedral symmetry (D9) is the two-dimensional symmetry group of the enneagon. The elements are 9 rotations, corresponding to rotations of 40 degrees around the origin, and 9 reflections, corresponding to the nine lines of symmetry of the enneagon. The abstract group is Dih9. The symbol for enneagonal dihedral symmetry is o9o.

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  • Enneagonal dihedral symmetry
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  • Enneagonal dihedral symmetry (D9) is the two-dimensional symmetry group of the enneagon. The elements are 9 rotations, corresponding to rotations of 40 degrees around the origin, and 9 reflections, corresponding to the nine lines of symmetry of the enneagon. The abstract group is Dih9. The symbol for enneagonal dihedral symmetry is o9o.
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abstract
  • Enneagonal dihedral symmetry (D9) is the two-dimensional symmetry group of the enneagon. The elements are 9 rotations, corresponding to rotations of 40 degrees around the origin, and 9 reflections, corresponding to the nine lines of symmetry of the enneagon. The abstract group is Dih9. The symbol for enneagonal dihedral symmetry is o9o.
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