I'm not even sure how to do this.
i have
length of arc - mab / 360 πd
circumference of a circle - πd or 2πr

8π

Step-by-step explanation:

360° = 2πr = πd

120° = 1/3 * 360°

120° = 2/3πr = 1/3πd

If the radius r = 12:

arcAB = 2/3π * 12 = 8π

AB = 8π

Step-by-step explanation:

The length of the arc AB is calculated as

AB = circumference of circle × fraction of circle

     = 2πr ×

     = 2π × 12 ×

     = 24π × = 8π

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