Respuesta :

Start with

[tex]2080 = \pi x r^2[/tex]

Divide both sides by pi:

[tex]\dfrac{2080}{\pi} = x r^2[/tex]

Divide both sides by x:

[tex]\dfrac{2080}{\pi x} = r^2[/tex]

Consider the square root of both sides:

[tex]r=\sqrt{\dfrac{2080}{\pi x}}[/tex]