Question

Нужна хелпа с маткой

Answer 1

$S_1=\pi R^2\frac{18^o}{360^o}=9\pi\cdot\frac1{20}=\frac9{20}\pi\\\\S_2=\pi R^2\frac{342}{360}=9\pi\frac{19}{20}=\frac{171}{20}\pi$