Mathematically, symmetry describes the nature or attribute of a shape being the exact reflection or form on opposite sides of a dividing line. Subtopics include; line and rotational symmetry. Facial symmetry is sometimes used as a measure of the attractiveness of a person.

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what does symmetry mean

sym·me·try

[sim-i-tree]

NOUN
[PLURAL SYM·ME·TRIES.]

1.

the correspondence in size, form, and arrangement of parts on opposite sides of a plane, line, or point; regularity of form or arrangement in terms of like, reciprocal, or corresponding parts.

2.

the proper or due proportion of the parts of a body or whole to one another with regard to size and form; excellence of proportion.

3.

beauty based on or characterized by such excellence of proportion.

4.

Physics. a property of a physical system that is unaffected by certain mathematical transformations as, for example, the work done by gravity on an object, which is not affected by any change in the position from which the potential energy of the object is measured.

Source:
Dictionary.com

In mathematics, symmetry means that both sides of something are exactly equal. For example, a square is symmetrical because if you fold it in half both sides are exactly equal.

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