Answer
$A(2)=12.56$
$A(5)=78.5$
$A(10)=314.0$
Work Step by Step
$A(2)=\pi(2^{2})=(3.14)(4)=12.56$
$A(5)=\pi(5^{2})=(3.14)(25)=78.5$
$A(10)=\pi(10^{2})=(3.14)(100)=314.0$
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