A perpendicular bisector is a particular type of line that intersects another line at a 90º angle, and the line it crosses is divided into two equal portions. Take for example the following lines:

In the above figure, *AD* is the perpendicular bisector to *BC*. That means that both *∠ADC* and ∠ADB = 90º and that the length of *BD* and *DC* are the same length. So, *D* is the midpoint to *BC*.

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