△ABC is congruent to △DEF. Write the name of the congruent triangle listing the vertices in corresponding order.
i know C is EDF but can't figure out the other two
Since each letter corresponds with the respective letter given, you can just put it in the same order. What I mean is A corresponds with D, B with E, and C with F. So, if you want CAB, you can do FDE. (a)
and for FED, you can get CBA (b)