Baby Names associated with Violet for Girls. Usage of these girl names was at its apex during the years 1910-1919 (usage of 0.1704%) and is somewhat lower today (usage 0.0573%, â¼ 66.4%), with names such as Yolanda, Ione and Iola becoming less stylish.
A rotation (or turn) is a transformation that turns a line or a shape around a fixed point. This point is called the center of rotation. We usually measure the number of degrees of rotation of a shape in a counterclockwise direction.
Symmetry occurs not only in geometry, but also in other branches of mathematics. Symmetry is a type of invariance: the property that something does not change under a set of transformations. Given a structured object X of any sort, a symmetry is a mapping of the object onto itself which preserves the structure. This occurs in many cases; for example, if X is a set with no additional structure, a symmetry is a bijective map from the set to itself, giving rise to permutation groups.