1.
a)Unghiuri suplementare=unghiuri a caror suma=180°
Daca sunt si congruente => fiecare unghi are 90°, adica sunt unghiuri drepte
b)Unghiurile opuse la varf sunt congruente.
c)360°
d)Egale.
e)De 90°
2.
a/b=7/11 =>a=7b/11
a+b=180 =>7b/11+b=180 =>7b+11b=1980 =>18b=1980 =>b=110° =>a=70°
3.
a/2+b/2=58°30'
a/2=3b/2=k
a=2k
b=2k/3
k+k/3=58°30'
3k+k=174°90'=175°30'
4k=175°30' =>k=43,875
=>a=87°45' si b=29°15'
