m(MNP) =360°-(m(MNQ)+m(PNQ))=360°-(130°+130°)=360°-260°=100
3.
Sa fie unghiurile a, b, c, d, e
m(a)+m(b) +m(c) +m(d) +m(e) =360°
{a,b,c,d,e} d.p. {2,3,4,5,6}
a/2=b/3=c/4=d/5=e/6=k urmeaza a=2k, b=3k,c=4k,d=5k,e=6k
2k+3k+4k+5k+6k=360°
20k=360°
k=18° urmeaza m(a)=36°,m(b)=54°,m(c)=72°,m(d)=90°,m(e)=108°
36°+54°+72°+90°+108°=360°
