Respuesta :

[tex] A = 4 \pi r^2 [/tex]

[tex] 3600 = 4\pi r^2 [/tex]

[tex] \dfrac{3600}{4 \pi} = r^2 [/tex]

[tex] r^2 = 286.479 [/tex]

[tex] r = 16.9 [/tex]

Answer: The radius is 16.9 mm.