Given: E is the midpoint of line AC, DE = EC Prove: line DE is congruent to line AE

Statements:

1. E is the midpoint of line AC
2. UNKNOWN
3. UNKNOWN
4. AE = DE
5. UNKNOWN
6. line DE is congruent to line AE

Reasons:
1. Given
2. Definition of Midpoint
3. Given
4. UNKNOWN
5. Definition of Congruence
6. UNKNOWN
I need to know what the unknown parts are.