# Is Arc Length Proportional to Circumference?

- Author:
- Rose Neal, bfuller181

An

**arc measurement**is a number (measured in degrees) representing the*amount of rotation*. Arc measure is a*portion*of**360 degrees**(1 full rotation). Remember, it is equal to the measure of the central angle. An**arc length**is is the distance '*walked*' along the edge of a circle. What is the**circumference**of a circle? EXPLORE: Move C around the edge of the circle. Observe what stays the same and what changes. Answer the questions below.## ARC MEASURE

What is the relationship between the measure of arc BC and the total degrees in a circle?

## ARC LENGTH

What is the relationship between the length of an arc and the circumference of a circle?