In Exercises 27 to 30, fill in the missing reasons for each geometric proof. 27. Given: D-E-F on DF D E F Prove: DE = DF-EF Exercises 27, 28 PROOF Statements Reasons 1. D-E-F on DF 1. ? 2. DE EF = DF 2. ? 3. DE DF - EF 3. ? 28. Given: Prove: E is the midpoint of DF DE = (DF) PROOF Statements Reasons 1. E is the midpoint of DF 1. ? 2. DE = EF 2. ? 3. DE EF = DF 3. ? 4. DE +'DE = DF 4. ? 5. 2(DE) = DF 5. ? 6 -