Evaluate
140\pi \approx 439.822971503
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\pi \times 56+2\pi \times 2\times 21
Multiply 2 and 28 to get 56.
\pi \times 56+4\pi \times 21
Multiply 2 and 2 to get 4.
\pi \times 56+84\pi
Multiply 4 and 21 to get 84.
140\pi
Combine \pi \times 56 and 84\pi to get 140\pi .
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