Mathematics, 20.10.2019 15:30 shilohtito
The area of a circle is 81pie square feet. what is the length of the radius? what is the length of the diameter? show steps!
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![\bf \textit{area of a circle}\\\\ A=\pi r^2~~ \begin{cases} r=radius\\[-0.5em] \hrulefill\\ A=81\pi \end{cases}\implies 81\pi =\pi r^2\implies \cfrac{81\pi }{\pi }=r^2\implies 81=r^2 \\\\\\ \sqrt{81}=r\implies \boxed{9=r}~\hspace{10em}\stackrel{\textit{diameter = twice the radius}}{18}](/tpl/images/0337/3602/2c2ad.png)
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