Unghiul MON = 70°. Se construieste OP.... voi lasa in poza datele problemei , DAU COROANA URGENT!!!

[tex]\it OP\perp OM \Rightarrow m(\widehat{POM}) =90^o\\ \\ m(\widehat{PON})=m(\widehat{POM})-m(\widehat{MON})=90^o-70^o=20^o[/tex]