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Studentka2010 [4]
3 years ago
14

Find the length of arc AB for each circle.

Mathematics
1 answer:
Eddi Din [679]3 years ago
8 0

Answer:

see explanation

Step-by-step explanation:

The length of the arc is calculated as

AB = circumference of circle × fraction of circle

(11)

AB = 2πr × \frac{90}{360}

     = 2π × 7 × \frac{9}{36}

     = 14π × \frac{1}{4}

     = \frac{7}{2} π in

(12)

AB = 2πr × \frac{135}{360} ( r = 20 ÷ 2 = 10 )

      = 2π × 10 × \frac{3}{8}

      = 20π × \frac{3}{8}

      = \frac{60}{8} π

      = \frac{15}{2} π cm

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