2 < opuse la varf sunt congruente, daca sunt complementare inseamna ca suma lor e 90
x+x=90, 2x=90, x=90:2=45 grade
<COM=<COA+<AOM
<AOC si <AOD sunt suplementare
< AOD=180-60=120 grd
<AOM=<AOD/2=120/2=60 grd
b.<BOD=<AOC=70 grd (opuse la varf)
<AOD=180-70=110 grd
<AOM=110/2=55 grd
<COM=70+55=125 grd
c. < AOC=180-120= 60 grd
rezultatul e identic cu a, < COM=120 grd
7. x+x+60=180 (ungh sunt suplementare)
2x=120, x=60
rezulta ca unghiurile au masura de 60 si 120 grade
8. <AOD=x, <AOC=x+20
x+x+20=180, 2x=160, x=<AOD=80 grade
<AOC=80+20=100 grade
<BOD=<AOC=100 grade
