# Angle Bisector Definition (SA.8)

- Author:
- Roger Gemberling, Tim Brzezinski

- Topic:
- Angles

In the applet below, the

**blue ray**is said to be an**angle bisector**of**angle**. The*BAC***gray slider**adjusts the entire measure of**angle**. The*BAC***black slider**dynamically illustrates what it means for a**ray**to**bisect**an angle. Interact with this applet for a few minutes, then answer the questions that follow.## Question1

From what you've seen, describe what it means for a **ray** to **bisect** an angle. *In your description, avoid using the words or phrases middle, down-the-middle, half**.*
If you need a hint, refer to terminology seen from this worksheet.

Use the

**Point on Object**tool to plot a point F anywhere on the**angle bisector**. Then use the**Angle**tool to find and display the measure of angle*BAF*and*CAF*.## Question 2

Did the measure of the angles BAF and CAF reflect (i.e. illustrate) your response to Question 1?

Open the

**Angle Bisector Construction**activity and complete it.