# Perpendicular Bisector Definition (SA.9)

- Author:
- Roger Gemberling, Tim Brzezinski

- Topic:
- Angles, Line Segment

In the applet below,

**line p**is said to be the**perpendicular bisector**of the segment with*and***A***as***B****endpoints**. Interact with this applet for a few minutes, then answer the questions that follow.*Be sure to change the locations of points***A**and**B**each time before you re-slide the slider.Reset the applet and re-slide the slider just one more time.

**Questions:**1) What can you conclude about the white point you see in the applet above? How do you know this? 2) What is the measure of the**gray angle**? How do you know this to be true? 3) Given your responses for (1) and (2) above, write your own definition for the term*perpendicular bisectorof a segment*. In essence, complete the following sentence definition: A**perpendicular bisector****of a segment**is...