Evaluate
\frac{4557\pi }{4}\approx 3579.059430602
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\pi \times 27060.25-\pi \times 161^{2}
Calculate 164.5 to the power of 2 and get 27060.25.
\pi \times 27060.25-\pi \times 25921
Calculate 161 to the power of 2 and get 25921.
1139.25\pi
Combine \pi \times 27060.25 and -\pi \times 25921 to get 1139.25\pi .
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