[latex]S= \frac{\pi*r^2}{360}* \alpha=3 \pi-9\\r^2= \frac{360*(3\pi-9)}{ \pi \alpha}\\r= \sqrt{ \frac{360(3\pi-9)}{ \pi \alpha }}[/latex]

DashuliaKopaeva    1   16.03.2020 00:06    0