Question

ajuda?????????????????

Answer 1

$Af = \frac{\alpha \ . \ 4\pi \ . \ r^{2}}{360} \\ \\ Af = \frac{40 \ . \ 4\pi \ .\ 5^{2}}{360} \\ \\ Af = \frac{160\pi \ .\ 25}{360} \\ \\ Af = \frac{4000\pi}{360} \\ \\ Af = \frac{100pi}{9} \\ \\ Af = 11,11 \pi \ cm^{2}$