Evaluate
\frac{13923\pi }{2}\approx 21870.197257965
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0.0425\pi \times 0.05\times 3600\times 910
Multiply 0.85 and 0.05 to get 0.0425.
0.002125\pi \times 3600\times 910
Multiply 0.0425 and 0.05 to get 0.002125.
7.65\pi \times 910
Multiply 0.002125 and 3600 to get 7.65.
6961.5\pi
Multiply 7.65 and 910 to get 6961.5.
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