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4 years ago

11

What is the area with circumference 36pi cm

1 answer:

Eddi Din [679]4 years ago

5 0

$\bf \textit{circumference of a circle}\\\\
C=2\pi r\qquad 
\begin{cases}
r=radius\\
-----\\
C=36\pi 
\end{cases}\implies 36\pi =2\pi r
\\\\\\
\cfrac{36\pi }{2\pi }=r\implies \boxed{18=r}\\\\
-------------------------------\\\\
\textit{area of a circle}\\\\
A=\pi r^2\qquad A=\pi \cdot \boxed{18}^2$

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