Answer:
The answer is 50 degrees
Step-by-step explanation:
The small box at the corner of the triangle indicates that the triangle is exactly 90 degrees, or a right angle. In order to solve the expression, you would need to do 40 + x = 90, which would be x = 50
It should be 40 degrees, If you have a protractor, you could measure it.
I think it's 40 degrees because if you fold it in half, it would probably match.
Not the best explanation, sorry.
