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24-02-2020
Mathematics

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9. The radius of a soccer ball is 18 cm. What is the length of an arc of the ball for a central angle of 45°.

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24-02-2020

Answer: 9pi/2 cm or 14.14 cm. To find the length of the arc, you must multiply the radius by the degree (in radians). Turn 45 degrees into radians, so divide it by 180 and you will get pi/4. Multiply this by the radius, and you will have 9pi/2, or 14.14cm.

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