Question

Please help!

What common angle do Triangle ACE and Triangle ACD share?
Angle AFB is approximately equal to Angle EFD
Angle ACE is approximately equal to Angle ECA
Angle EBC is approximately equal to Angle ECB
Angle CAD is approximately equal to Angle CEB

Answer 1

The first one is correct because the angle on the opposite side is the same, and the second one is correct too because it's the same points.  So you can pick either or.

Answer 2

Angle ACE is approximately equal to Angle ECA

Explanation:

we know that

In the figure

The vertex C is a common vertex of triangle ACE and triangle ACD

therefore

m<ACE=m<ACD

m<ACE=m<ECA