Evaluate
\frac{40\pi ^{2}}{9}\approx 43.864908449
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\frac{20\pi \times 2\pi }{3\times 3}
Multiply \frac{20\pi }{3} times \frac{2\pi }{3} by multiplying numerator times numerator and denominator times denominator.
\frac{20\pi ^{2}\times 2}{3\times 3}
Multiply \pi and \pi to get \pi ^{2}.
\frac{40\pi ^{2}}{3\times 3}
Multiply 20 and 2 to get 40.
\frac{40\pi ^{2}}{9}
Multiply 3 and 3 to get 9.
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