Find the exact length of adc . in your final answer, include all of your calculations.

  15π m

Step-by-step explanation:

Short arc AC is 60°, so long arc ADC will be 360°-60° = 300°. As a fraction of the circumference of the circle it is

  (300°/360°)C = 5/6C

where C is the circumference:

  C = 2πr = 2π(9 m) = 18π m

Then the arc length is ...

  arc ADC = (5/6)(18π m) = 15π m

one that is bigger than 3 1/2