Question

I'm not even sure how to do this.

I have
Length of arc - mAB / 360 πd
Circumference of a circle - πd or 2πr

Help

Answer 1

AB = 8π

Explanation:

The length of the arc AB is calculated as

AB = circumference of circle × fraction of circle

= 2πr ×
`(120)/(360)`

= 2π × 12 ×
`(1)/(3)`

= 24π ×
`(1)/(3)` = 8π

Answer 2

8π

Explanation:

360° = 2πr = πd

120° = 1/3 * 360°

120° = 2/3πr = 1/3πd

If the radius r = 12:

arcAB = 2/3π * 12 = 8π