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   Symmetry
  is when one shape becomes exactly like another if you flip, slide or turn it 
  . 
  The simplest type of Symmetry is "Reflection" (or
  "Mirror") Symmetry, 
  the quality of being made up of exactly similar parts facing each other or
  around an axis. 
   
  "this series has a line of symmetry through its center" 
   
  synonyms: 
  regularity, evenness, uniformity, consistency, conformity, correspondence, equality; 
  correct or pleasing proportion of the parts of a
  thing. 
  "an overall symmetry making the poem
  pleasant to the ear" 
   
  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 o f proportion. 
   
  4. 
  Mathematics . 
  a. 
  a geometrical or other regularity that is
  possessed by a mathematical object and is characterized by the operations
  that leave the object invariant: A circle has rotational symmetry and
  reflection symmetry. 
  b. 
  a rotation or translation of a plane figure that
  leaves the figure unchanged although its position may be altered. 
  5. 
  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. 
    
    
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