Răspuns:
m(B)=2m(A)/3
m(C)=m(A)/6
m(D)=1 intreg si 1/4=5/4=5m(B)/4
A+B+C+D=360
A+2A/3+A/6+5B/4=360
A+2A/3+A/6+5·2A/3·4=360
A+2A/3+A/6+5A/6=360 amplific
6A+4A+A+5A=2160
16A=2160
A=2160:16=>A=135°
B=2·135:3=>B= 90°
C=135:6=22,5=22°si 30 min
D=5·135:6=112,5=112° si 30 min
