The picture is cut off so if they are asking you to round to the nearest tenth the answer is 50, if not it is 45
Answer : 50
So the total degrees of a triangle are 180
you know that one of the angles has 90
so do 180 - 90 = 90
so now do 90 in half, so 45
45 rounded to the nearest 10th is 50
Hope this Helped :)