Answer:
15 degrees
Explanation:
To find the angle, first consider that you have to find all the the other angles inside the triangle (which should equal 180 degrees). Second, the angle that is missing is supplementary to the angle 40 degrees in the other triangle and the 2 angles should add up to 180 degrees as well. Meaning that angle is 140 degrees.
If you add 140 degrees and 25 degrees, you should get 165 degrees, leaving the remaining 15 degrees to be made up by the last angle, the one you're looking for, FHE.