Explanation:
The two triangles are symmetrically the same the only difference is they are opposite Intersecting at C.
Angle DCE and BCA intersect from the triangles which both form a similar angle let's assume are 60 degrees.
Therefore, Angle ACE and BCD are 120 degrees.
Therefore all sides from both triangles correspond to be both equal, for example, BA = ED, AC = DC, BC = EC
C is the midpoint of AD and BE therefore AC = CD and BC = CE.
The angles too are equally corresponding such as,
Angle ABC = DEC , CAB = CDE and BCA = ECD