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Axis of Symmetry

A line of symmetry for a graph. The two sides of a graph on either side of the axis of symmetry look like mirror images of each other.

 

Example:  

This is a graph of the parabola y = x2 – 4x + 2 together with its axis of symmetry x = 2.

The axis of symmetry is the red vertical line.

 

 

See also

Point of symmetry, axis of symmetry of a parabola, symmetric about the x-axis, symmetric about the y-axis

 


  this page updated 27-aug-12
Mathwords: Terms and Formulas from Algebra I to Calculus
written, illustrated, and webmastered by Bruce Simmons
NCTM Web Bytes December 2004 Web Bytes March 2005 Web Bytes