Question

Calculati aria figurei hasurate,dau coroana

Answer 1

$\ii MNPO=p\breve{a}trat,\ \ MN=2\ cm \Rightarrow ON=2\sqrt2\ cm\ (diagonala\ p\breve{a}tratului).\\ \\ ON = R\ (raza\ cercului)\\ \\ \mathcal{A}=\dfrac{\pi\ R^2}{4} =\dfrac{\pi\cdot (2\sqrt2)^2}{4}=\dfrac{\pi\cdot 4\cdot2}{4}=2\pi\ cm^2$