m2+m4=180Gr
m5=65Gr=m1(alterne externe)
m3=m5=65Gr(corespondente)
m2=180Gr-m3=180gr-65Gr=115Gr
m4=180gr-m2=180Gr-115Gr=65Gr=m3(alterne interne)
Sper c am ajutat
