[tex]\begin{gathered} r=6600\operatorname{km} \\ r+h=6600\operatorname{km}+7\operatorname{km} \\ r+h=6607\operatorname{km} \\ (r+h)^2=r^2+d^2 \\ d^2=(r+h)^2-r^2 \\ d=\sqrt{(r+h)^2-r^2} \\ d=\sqrt[]{(6607)^2-(6600)^2} \\ d=304\operatorname{km} \\ A\text{ person can s}ee\text{ 304 km} \end{gathered}[/tex]
