To answer this question, we need to remember that the sum of the internal angles of a triangle is equal to 180°. We have two triangles, and we need to find the measure for one of the angles of each of them.
Then we have:
Triangle ABC
We have that:

Then

Now, to solve the equation, we have to subtract 90° from both sides of the equation:

Therefore, m
Triangle DEF
We can proceed similarly in this case. Then we have:

Finally, we can subtract 76 degrees from both sides of the equation:

Therefore, the measure of the angle F is equal to 104 degrees, m.
In summary, we have that:
