Question

ДОПОМОЖІТЬ БУДЬ ЛАСКА!ДАМ 70б!​

Answer 1

$\displaystyle\bf\\L=3\pi \ \ \ ; \ \ \ \alpha =36^\circ \ \ \ , \ \ \ R=?\\\\\\L=\frac{\pi R}{180}\cdot \alpha \\\\\\\pi R \alpha =180 L\\\\\\R=\frac{180 L}{\pi \alpha } =\frac{180\cdot 3\pi }{\pi \cdot 36}=15\\\\\\Otvet \ : \ 15$