Evaluate
\frac{1}{940000000\pi }\approx 3.386275385 \cdot 10^{-10}
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\frac{1}{20000\pi \times 47000}
Multiply 2 and 10000 to get 20000.
\frac{1}{940000000\pi }
Multiply 20000 and 47000 to get 940000000.
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