Evaluate
50\pi \approx 157.079632679
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\frac{\pi \times 2\times 100}{4}
Calculate 10 to the power of 2 and get 100.
\frac{\pi \times 200}{4}
Multiply 2 and 100 to get 200.
\pi \times 50
Divide \pi \times 200 by 4 to get \pi \times 50.
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