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 Everyday Examples
 Reflection Line:  A line that acts as a mirror in the form of a perpendicular bisector so that corresponding points are the same distance from the mirror.
The middle post on this arched entrance is the reflection line, because it divides the structure into two parts which mirror each other. Look at the horizontal bar connecting the two posts on each end. If you extend the middle post, you can see that it is the perpendicular bisector of the horizontal bar.

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