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Whoever wrote this question for you would be happy to see "pi" in the answer rather than "3.14." So I will use pi. Measure of central angle/360=arc length/2pi*r; measure.../360=pi/2pi*9; measure.../360=1/18; measure...=360/18=20. The measure of the central angle is 20 degrees.
arc length/circumference=central angle/360 1/9=central angle/360 central angle=40
The sum of the two angles is 360. So angle ABC = 120 degrees.
30 is the answer A+ student raynaray
An angle with 30 degrees is an acute angle.