Răspuns:
Explicație pas cu pas:
A+B+C+D=360
A+75+C+D =360
A+C+D =360-75 =285°
0.1(6)=16-1/90 =1/6 ; inv prop 6/1 =6
0.25 =25/100 =1/4 ; inv prop 4/1 =4
0.1(1) =11/1/90 =10/90 =1/9 ; inv prop 9/1 =9
A/6=C/4=D/9 =k
A/6=k ; A=6k
C/4=k ; C=4k
D/9=k ; D=9k
6k+4k+9k =285
19k =285
k=285:19 =15
A=6k ; A=6*15 =90°
C=4k ; C=4*15 =60°
D=9k : D=9*15 =135°