Evaluate
3200\pi \approx 10053.096491487
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400\pi \times 2+40\pi \times 60
Calculate 20 to the power of 2 and get 400.
800\pi +40\pi \times 60
Multiply 400 and 2 to get 800.
800\pi +2400\pi
Multiply 40 and 60 to get 2400.
3200\pi
Combine 800\pi and 2400\pi to get 3200\pi .
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