In a circle with center O, the measure of central angle AOB is 120 degrees. If the radius of the circle is 9 units, what is the length of arc AB?
Correct: C
The formula for the length of an arc (L) is L = (θ/360°) * 2πr, where θ is the central angle in degrees and r is the radius.
Given θ = 120 degrees and r = 9 units.
L = (120/360) * 2π(9)
L = (1/3) * 18π
L = 6π units.