Resposta :
[tex]C=2\pi{r}=40000\\ r=\frac{40000}{2\pi}=\frac{20000}{\pi} \\ \\A=r^2*\pi=(\frac{20000}{\pi})^2*\pi=\frac{400000000}{r}Km^2[/tex]
[tex]A_{fuso}=\frac{\frac{400000000}{\pi}}{24}=\frac{400000000}{\pi*24}=\\ A_{fuso}=\frac{400000000}{75,36}\approx5306855,6263Km^2/fuso[/tex]