The circle below has center O, and its radius is 9 cm. Given that $m\angle AOB = 40^\circ$, find the length of the major arc ACB. Give an exact answer in terms of $\pi$, and be sure to include the correct unit in your answer.
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Since the angle at the center of a circle is twice the angle at the circumference, the angle ACB is half of 408 degrees, which is 204 degrees. Show more…
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