Evaluate
4\pi \approx 12.566370614
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36\pi \times \frac{40}{360}
Multiply 2 and 18 to get 36.
36\pi \times \frac{1}{9}
Reduce the fraction \frac{40}{360} to lowest terms by extracting and canceling out 40.
\frac{36}{9}\pi
Multiply 36 and \frac{1}{9} to get \frac{36}{9}.
4\pi
Divide 36 by 9 to get 4.
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