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 Everyday Examples
 Axis of Symmetry:  A line that a figure can be folded over so that one-half of the figure matches the other half perfectly; a line about which a figure is symmetrical.
The middle post on this arched entrance is the axis of symmetry, because it divides the structure into two parts which mirror each other.

This arch is held up by three posts.  The middle post serves as the axis of symmetry in this picture.