[tex]pole\ kola:\\\\ P=\frac{25}{8}\ \pi\\\\ obliczam\ promien\ kola:\ r\\\\P=\pi r^2\\\\\pi r^2=\frac{25}{8}\ \pi\ \ |:\pi\\\\r^2=\frac{25}{8}\\\\r=\sqrt{\frac{25}{8}}=\frac{\sqrt{25}}{\sqrt{8}}=\frac{5}{\sqrt{4 *2}}=\frac{5}{2\sqrt{ 2}}* \frac{\sqrt{2}}{\sqrt{2}}=\frac{5\sqrt{2}}{2*2}=\frac{5\sqrt{2}}{4} \\\\cd.\ w\ zalaczniku[/tex]
