Răspuns:
1.
a) A+B+C+D=360°
A+2A+A+50°+3A-47°=360°
7A=360°-3°
7A=357°
A=51°
B=102°
C=101°
D=106°
b) D+35°+3D+3D-43°+D=360°
8D=360°+8
8D=368°
D=48°
A=83°
B=144°
C=101°
2.
a) 100=AB+2AB+AB+13+AB-8
100=5AB+5
5AB=95
AB=19
BC=38
CD=32
DA=11
b) 100=AD+15+3AD+AD-5+AD
100=6AD+10
6AD=90
AD=15
AB=30
BC=45
CD=10
