Question

How do you find the radius if you know the area of a circle?

Answer 1

$a = \pi \: {r}^{2}$

u take ur known variables and fill them in, pi will be filled in as 3.14

Example:

$153.86 = 3.14 {r}^{2}$

Then divide both sides by 3.14, after that it should be (number) =r². since it's squared you have to find to square root of both.

Example:

$\sqrt{49} = \sqrt{ {r}^{2} } \\ 7 = r$

therefore in this example the radius is 7