Evaluate
8\pi \approx 25.132741229
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200\pi \times 40\times 10^{-3}
Multiply 2 and 100 to get 200.
8000\pi \times 10^{-3}
Multiply 200 and 40 to get 8000.
8000\pi \times \frac{1}{1000}
Calculate 10 to the power of -3 and get \frac{1}{1000}.
8\pi
Multiply 8000 and \frac{1}{1000} to get 8.
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