Answer:
x = 80°
Step-by-step explanation:
To solve this we just need to know that the sum of the inner sides of a triangle will always give us 180 °
from here we only have to apply a simple formula by adding the sides of the triangle and knowing that the result is 180 and from there clear the value x that we need to find out
70 + 30 + x = 180
x = 180 -30 - 70
x = 80°
