Pre- Calculus HELP!!!?

This is a question in Pre-Calculus I can't seem to get right :/

Link to picture of Triangle in Problem:
http://www.schoolathome.ca/online/file.php/242/Chapter_3/3-3-1.jpg

Consider ?DEF with Angle D = 90?° and Angle E = 50°:

I got A, B, and C right...
a)Name side DE another way.
f

b)What is the size of Angle F?
40°

c)What is the shortest side of ?DEF?
f

but i still can't figure out d...
d)Name Angle F another way.
the answer is not ed, de, or f.

Any help would be greatly appreciated!!! =]
 
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