Respuesta :

60 + 55 + x + 20 = 180
135 + x = 180
x = 180 - 135 = 45 degrees Answer.

Answer:

45

Step-by-step explanation:

60 + 55 + x + 20 = 180

135 + x = 180

x = 180 - 135 = 45

Answer: 45