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  1. For each circle below, what are the arc length and the area of the shaded sector? Write your answers in terms of π. Homework Help ✎

  2. a. mAOB = 120°

    b. CD = 6 in

arc length = (fraction of circle)(circumference of circle)

sector area = (fraction of circle)(area of circle)

Use the same two methods as part (a). What is the radius of this circle?