Explicație pas cu pas:
A/3=B/4=C/5=D/6=E/18= k
A=3k
B=4k
C=5k
D=6k
E=18k
A+B+C+D+E=360
3k+4k+5k+6k+18k=360
36k=360| :36
k=10
A=3•10=30
B=4•10=40
C=5•10=50
D=6•10=60
E=18•10= 180
