Explicație pas cu pas:
A=6/11 B=16/19C
B=11/6 A
C=19/6 A
A+B+C=180°
A+11/6 A +19/6 A =180°
A (1+11/6+19/6)=180°
A×6+11+19/6=180°
36/6 A =180°
6A=180°
A=180°/6
A=30°
B=11/6 A =11/6×30=11×5=55°
B=55°
C=19/16 A=19/16×30=19×5=95°
C=95°
Verificare :
A+B+C=30°+55°+95°180°
