The area of a circle is 78.5 square meters. what is the radius ?

Mathematics

2 answers:

Rina8888 [55]3 years ago

7 0

The radius will be = 5

Nataly [62]3 years ago

3 0

$\bf \textit{area of a circle}\\\\
A=\pi r^2\quad 
\begin{cases}
r=radius\\
------\\\
A=78.5
\end{cases}\implies 78.5=\pi r^2\implies \cfrac{78.5}{\pi }=r^2
\\\\\\
\sqrt{\cfrac{78.5}{\pi }}=r$

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