Respuesta :

60 + 90 + x = 180
150 + x = 180
X = 180-150
X= 30

To prove that this is the right answer
60+60+30+30=180
180=180
That’s a 90° angle, so it should be 90+60+30=180°, just put down something like 60+y+x=180° y=90 x=30. Then solve it.