Find the length of a circle with a radius of 9 cm. What is the length of its arc with a degree measure of 20 degrees?

Circumference:

L = 2 п R;

L = 2 * 3.14 * 9 ≈ 56.52 (cm);

Arc 20 °:

360: 20 = 18 times the circumference.

Arc length:

l = 1/18 * 56.52 ≈ 3.14 (cm);



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