# G.GCO.1 Angle Bisector Definition (I)

- Author:
- Dan Dale, 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.## 1.

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". **

## 2.

Use the **Point on Object** tool to plot a point F anywhere on the **angle bisector**.
Use the **Angle** tool to find and display the measure of angle *BAF* and *CAF*.
How do these results reflect (i.e. illustrate) your response to (1)?