Răspuns :
a, b, c - unghiuri
a=90 grade
a+b+c=180
90+b+c=180
b+c=180-90
b+c=90
b=2c
2c+c=90
3c=90
c=90:3
c=30 de grade
b=2*30
b=60 de grade
a=90 grade
a+b+c=180
90+b+c=180
b+c=180-90
b+c=90
b=2c
2c+c=90
3c=90
c=90:3
c=30 de grade
b=2*30
b=60 de grade
unghil A= x
unghi B= 2x
3x= 180-90
3x=90 | :3
x=30 => Unghiul A= 30 grade
Unghiul B= 90-30=60 de grade