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SYMETRIE REVOLUTION ORDRE N [1 record]

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Record 1 1991-02-04

English

Subject field(s)
  • Plane Geometry
  • Mineralogy
CONT

"symmetry": In general, a figure or expression is said to be symmetric if parts of it may be interchanged without changing the whole. ... A right circular cone has an axis of symmetry. A geometric figure has n-fold rotational symmetry about an axis if a rotation of 360°/n is a symmetry of the figure. Thus an axis of symmetry can be a rotational axis. For example, an axis through the centre of a square perpendicular to the plane is a 4-fold axis since a rotation of 360°/4 produces an identical figure; a diagonal is a 2-fold axis.

French

Domaine(s)
  • Géométrie plane
  • Minéralogie
OBS

Proposition de M. Jean-Marc TERRIER, professeur de mathématiques à l'Université de Montréal, après qu'il ait consulté un collègue cristallographe.

Spanish

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