# Central & Intercepting Angles

- Author:
- WheelerELHS, Jeff DeVries

The applet below illustrates the

**types of angles**that can be formed inside a circle.When point E and point P coincide, the **green angles** that are formed are __specifically__ called ____________ _____________, because the vertex is positioned at the center of the circle.

Now, drag points A, B, C, or D and observe how the positioning of the **green angles **changes.
When point E and point P no longer coincide, the **green angles** that are formed are __more generally__ called ____________ ____________, because both sides of the angle intersect an arc of the circle.

## Definition of Arc Measure

Click "Reset to Central Angle".
By definition, the **measures of the red arc** **and** **blue arc** are _________________ to the measure of the central angle.