Answer:
x = 40
Step-by-step explanation:
A right angle measures 90 degrees, so the part labeled 2x measures 90-10 = 80 degrees. If 2x is 80 degrees, x must be 40 degrees.
x = 40
The angle is a right angle, which = 90 degrees.
2 x 40 = 80
80 + 10 = 90