Răspuns :
A×2,5=D×1,(6)
25/10A=16-1/9D
25/10A=15/9D
5/2A=5/3D=x
180°=A+D
180°=2x
x=90°
5/2A=x
5/2A=90
A=90°÷5/2
A=90×2/5
A=180/5
A=36
D×5/3=x
D×5/3=90
D=90÷5/3
D=90×3/5
D=270/5
D=54
36°+54°=90°
A×2,5=D×1,(6)
25/10A=16-1/9D
25/10A=15/9D
5/2A=5/3D=x
180°=A+D
180°=2x
x=90°
5/2A=x
5/2A=90
A=90°÷5/2
A=90×2/5
A=180/5
A=36
D×5/3=x
D×5/3=90
D=90÷5/3
D=90×3/5
D=270/5
D=54
36°+54°=90°