Answer:
50º
Explanation:
Since all angles of a triangle have a sum of 180º, we can add 90º (since it's a right triangle) and 40º. This gives us 130º, which we can then subtract from the 180º total. The answer is then 50º.
50
a right triangle is 90 degrees so if one angle is 40 the other has to be 50.
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