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 Description  
 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.

 

In this example, the quadrilateral ACDB has been reflected over the vertical segment, which serves at the reflection line, to form the image A'C'D'B'. Now, we can connect a point, A for example, and its image, A'. Then point P is the point of intersection of the reflection line and segment AA', and it is the midpoint of the segment AA'. Also, the reflection line is perpendicular to the segment AA'. Thus, the reflection line is the perpendicular bisector of segment AA'.