Answer: The answer is 90!
Explanation:
A triangle's sides have to equal 180 degrees. The other two angles measure 45 degrees + 45 degrees, which equals 90. Now all you have to do is subtract 90 from 180. This equals 90, so the answer is 90 degrees.
Whenever you do problems like this in the future, remember these steps:
Angle 1 + Angle 2
180 - Combination of Angles 1 and 2 = Answer
The reason that you subtract from 180 degrees is because a straight angle is always 180 degrees. If you need more help with problems like these, I recommend watching some tutorials!
I hope this helped you!