Răspuns:
57°; 33°
Explicație pas cu pas:
[tex]\dfrac{m(unghiAND)}{m(unghiDAN)} =\dfrac{0,4(2)}{0,2(4)}\\ 0,4(2)=\dfrac{42-4}{90}=\dfrac{38}{90},~~~~ 0,2(4)=\dfrac{24-2}{90}=\dfrac{22}{90}, ~~deci~\dfrac{0,4(2)}{0,2(4)}=\dfrac{38}{90}:\dfrac{22}{90}=\dfrac{38}{90}*\dfrac{90}{22}=\dfrac{19}{11}\\=>~\dfrac{m(unghiAND)}{m(unghiDAN)} =\dfrac{19}{11},~=>~\dfrac{m(unghiAND)+m(unghiDAN)}{m(unghiDAN)} =\dfrac{19+11}{11},~=>[/tex][tex]=>~\dfrac{90}{m(unghiDAN)} =\dfrac{^{3)}30}{11} ,~=>~~\dfrac{90}{m(unghiDAN)} =\dfrac{90}{33}[/tex]
⇒m(∡DAN)=33°, atunci m(∡AND)=90°-33°=57°