Evaluate
\frac{40\pi }{9}\approx 13.962634016
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2\pi \times \frac{800}{360}
Multiply 10 and 80 to get 800.
2\pi \times \frac{20}{9}
Reduce the fraction \frac{800}{360} to lowest terms by extracting and canceling out 40.
\frac{2\times 20}{9}\pi
Express 2\times \frac{20}{9} as a single fraction.
\frac{40}{9}\pi
Multiply 2 and 20 to get 40.
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