Evaluate
628
Factor
157\times 2^{2}
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6.28\times \left(\frac{20}{2}\right)^{2}
Multiply 2 and 3.14 to get 6.28.
6.28\times 10^{2}
Divide 20 by 2 to get 10.
6.28\times 100
Calculate 10 to the power of 2 and get 100.
628
Multiply 6.28 and 100 to get 628.
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