Question

the area of a circle is 1256 square inches what is the length of its radius

Answer 1

The formula of the area of a circle is : $A= \pi R^2$

You know that the area is 1256.

So : $1256= \pi R^2$

Divide both sides by $\pi$ :

$\frac{1256}{\pi}=R^2$

 take the square root of both sides in order to obtain r :

$\sqrt{ \frac{1256}{ \pi }}=R$
$20=R$

In short, the answer would be 20 (i have rounded).

Hope this helps !

Photon