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Digiron [165]
3 years ago
14

What is the radius of this problem ?

Mathematics
2 answers:
vekshin13 years ago
8 0
\bf \textit{area of a circle}\\\\
A=\pi r^2\qquad 
\begin{cases}
r=radius\\
------\\
A=64\pi 
\end{cases}\implies 64\pi =\pi r^2
\\\\\\
\cfrac{64\pi }{\pi }=r^2\implies 64=r^2\implies \sqrt{64}=r\implies 8=r
BigorU [14]3 years ago
6 0
A= \pi r^2 \\  \\  \pi r^2=64 \pi  \ \ \to \ \ r^2= \frac{64 \pi }{ \pi }  \ \ \to \ \ r= \sqrt{ 64 } = 8
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