Question

Which of the following equations can be used to solve for the radius (r)

Answer 1

I think it might be the third answer but im not sure

Answer 2

Answer:

The last option is the correct answer: $r=\sqrt{\frac{A}{\pi}}$

Step-by-step explanation:

The area of a circle is given by :

$A=\pi r^{2}$ ; where r is the radius.

Now, lets find the radius.

$\frac{A}{\pi } =r^{2}$

$\sqrt{\frac{A}{\pi}} =r$

or $r=\sqrt{\frac{A}{\pi}}$

Therefore, the last option is the correct answer.