Relax

Respuesta :

4060s

Answer:

x = 10 degrees

Step-by-step explanation:

Interior angles of a triangle add up to 180.

x + 8x + 90 = 180

9x = 90

x = 10

Answer:

x+8x+90=180(sum of angle of triangl

9x=180-90

x=90/9=10