Find the length of arc AB for each circle.

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Step-by-step explanation:

The length of the arc is calculated as

AB = circumference of circle × fraction of circle

(11)

AB = 2πr ×

     = 2π × 7 ×

     = 14π ×

     = π in

(12)

AB = 2πr × ( r = 20 ÷ 2 = 10 )

      = 2π × 10 ×

      = 20π ×

      = π

      = π cm

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step-by-step explanation:

i believe the correct answer is b.