Respuesta :

Photon
The formula of the area of a circle is : [tex]A= \pi R^2[/tex]

You know that the area is 1256.

So : [tex]1256= \pi R^2[/tex]

Divide both sides by [tex] \pi [/tex] :

[tex] \frac{1256}{\pi}=R^2[/tex]

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

[tex]\sqrt{ \frac{1256}{ \pi }}=R[/tex]
[tex]20=R[/tex]

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

Hope this helps !

Photon


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