Evaluate
9\pi \approx 28.274333882
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\frac{1}{4}\times 36\pi
Reduce the fraction \frac{90}{360} to lowest terms by extracting and canceling out 90.
\frac{36}{4}\pi
Multiply \frac{1}{4} and 36 to get \frac{36}{4}.
9\pi
Divide 36 by 4 to get 9.
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