Answer:
It should be 40 degrees, If you have a protractor, you could measure it.
Explanation:
I think it's 40 degrees because if you fold it in half, it would probably match.
Not the best explanation, sorry.
The answer is 50 degrees
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
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