Evaluate
\frac{400000}{81\pi }\approx 1571.900672513
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\frac{1}{90\pi \times 2.25\times 10^{-6}}
Multiply 2 and 45 to get 90.
\frac{1}{202.5\pi \times 10^{-6}}
Multiply 90 and 2.25 to get 202.5.
\frac{1}{202.5\pi \times \frac{1}{1000000}}
Calculate 10 to the power of -6 and get \frac{1}{1000000}.
\frac{1}{\frac{81}{400000}\pi }
Multiply 202.5 and \frac{1}{1000000} to get \frac{81}{400000}.
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