A circle has center O and arc AB with central angle 45°. If arc AB has length 3 inches, the circumference of the circle is:
A12
B18
C24
D36
Answer & Solution
Correct answer: C. 24
Arc length / circumference = central angle / 360°. So 3 / C = 45 / 360 = 1/8. Therefore C = 3 × 8 = 24 inches.
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