Thats easy. figure it out
Answer: A) ΔABD ≡ ΔECD
<u>Step-by-step explanation:</u>
Match up the letters of the congruent sides.
AD = ED and BD = CD
A D B D → ABD
E D C D → ECD
This can be written in any order as long as the letters are matched properly. A & E, D & D, B & C
ADB or BDA or ...
EDC CDE
The only correct option provided is option A.
The sum of ext. angles on any convex polygon is always 360 degrees