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cluponka [151]
2 years ago
12

Pleaseeeee help with this! Thank you so much!

Mathematics
1 answer:
algol [13]2 years ago
6 0

Answer:

≈ 7.85 cm

Step-by-step explanation:

The area (A) of a circle is calculated as

A = πr² ( r is the radius )

given A = 225π , then

πr² = 225π ( divide both sides by π )

r² = 225 ( take square root of both sides )

r = \sqrt{225} = 15

the arc length is calculated as

arc = circumference × fraction of circle

      = 2πr × \frac{30}{360}

      = 2π × 15 × \frac{1}{12}

      = 30π × \frac{1}{12}

      = \frac{30\pi }{12}

      ≈ 7.85 cm ( to 2 dec. places )

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