Evaluate
5\pi \approx 15.707963268
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12\pi \times \frac{150}{360}
Multiply 2 and 6 to get 12.
12\pi \times \frac{5}{12}
Reduce the fraction \frac{150}{360} to lowest terms by extracting and canceling out 30.
5\pi
Cancel out 12 and 12.
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