Question

Given the following angles, what ray is the common side of ∠CFD and ∠DFE?

Answer 1

recall that the middle point in an angle name is the vertex. therefore we can draw <CFD like so:

Answer 2

now, for DFE, we can "re-use" the points D and F that we already drew.

I'll draw DFE in a different color



so, what ray is common to both angles?