Evaluate
36000\pi \approx 113097.335529233
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\frac{\pi \times 900}{4}\times 160
Multiply 30 and 30 to get 900.
\pi \times 225\times 160
Divide \pi \times 900 by 4 to get \pi \times 225.
\pi \times 36000
Multiply 225 and 160 to get 36000.
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