Answer :
[tex]\Delta\ EFG\ is\ right\ triangle\ :)\ (look\ at\ the\ picture)\\\\Circumference\ of\ right\ triangle\ is\ in\ the\ middle\ of\ the\ hypotenuse\ (EG).\\\\C\left(\frac{3+7}{2};\ \frac{6+4}{2}\right)\to\boxed{C(5;\ 5)}[/tex]
![View image Аноним](https://us-static.z-dn.net/files/dff/207fb24ab1a80fcb83367287b5432bfc.png)