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Circular symmetry : ウィキペディア英語版
Circular symmetry

In geometry, circular symmetry is a type of continuous symmetry for a planar object that can be rotated by any arbitrary angle and map onto itself.
Rotational circular symmetry is isomorphic with the circle group in the complex plane, or the special orthogonal group SO(2), and unitary group U(1). Reflective circular symmetry is isomorphic with the orthogonal group O(2).
== Two dimensions==

A 2-dimensional object with circular symmetry would consist of concentric circles and annular domains.
Rotational circular symmetry has all cyclic symmetry, Z''n''v as subgroup symmtries. Reflective circular symmetry has all dihedral symmetry, Dih''n''v as subgroup symmetries.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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