The two column proof has shown that:
The two triangles are congruent by SAS congruency postulate
How to use the Two Column Proof?
The two column proof to show that the two triangles are congruent is:
Statement 1: C is the midpoint of AD and BE
Reason 1: Given
Statement 2: AC ≅ CD
Reason 2: Definition of midpoint
Statement 3: BC ≅ CE
Reason 3: Definition of midpoint
Statement 4: ∠ACB ≅ ∠ECD
Reason 4: Vertical angles are congruent
Statement 5: ΔABC ≅ ΔDEC
Reason 5: SAS congruency postulate