# If the area of a circle is 70cm^2,find the radius?

May 15, 2018

r = ~4.72 cm

#### Explanation:

Area of Circles

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

$70 = \pi {r}^{2}$

Divide by pi to get ${r}^{2}$ isolated.

$\frac{70}{\pi} = {r}^{2}$

Now, find the square root:

$\sqrt{\frac{70}{\pi}} = r$

$r$ = 4.72034871941