Given:
C is the midpoint of segment AE
C is the midpoint of segment BD
Segment AE is congruent to segment BD

Prove:
Segment AC is congruent to segment CD

Left column:
1. C is the midpoint of segment AE
C is the midpoint of segment BD
Segment AE is congruent to segment BD
2. AC=CD
BC=CD
3. AE=BD
4. AE=AC+CE
BD=BC+CD
5. AC+CE=BC+CD
6. AC+AC=CD+CD
7. 2AC=2CD
8. AC=CD
9. Segment AC is congruent to segment CD

Have to find right column.