Question 3375
In any triangle, the sum of all angles is 180 degrees. Since in a
right triangle, one angle is always 90 degrees, that leaves 180-90=90
degrees for the sum of two other sharp angles. So, since one angle is
given as 74+9 degrees, the other sharp angle is 90-74+9, or
16 degrees. 
So, the answer is that the angles of this straight triangle are 90,
74+9, and 16 degrees.