Chords AC and DB intersect at point E. Explain this problem by listing 3 pairs of angles that must be congruent.

1) Angle CEB and Angle DEA must be congruent because they are vertical angles. 

2) Angle ADB and Angle ACB must be congruent because they are inscribed angles that intercept the same arc

3) Angle DAC and Angle DBC must be congruent because they are inscribed angles that intercept the same arc