Respuesta :

ChezCake14

Answer:

x = 39°

Step-by-step explanation:

51° + 90° = 141°

180° - 141° = x

x = 39°

They often don't label the 90° angle, so watch out for that in the future

zaradyer
54 + 90 = 144
180 - 144 = 36
36°