# How do you find the length of an arc with the radius?

## How do you find the length of an arc with the radius?

The arc length of a circle can be calculated with the radius and central angle using the arc length formula,

• Length of an Arc u03b8 xd7 r, where u03b8 is in radian.
• Length of an Arc u03b8 xd7 (u03c0/180) xd7 r, where u03b8 is in degree.

5.23 cm

8.97 cm

## How do you find the arc length with the radius in terms of pi?

To find the arc length, set up the formula Arc length 2 x pi x radius x (arc’s central angle/360), where the arc’s central angle is measured in degrees.