What is the missing reason in line 12
Given: line / m
Prove: 21427
Reasons
Statements
1. Linelis parallel to linem
2. 42 & 25 are
corresponding angles.
2. Definition of corresponding
angles
3. 41=42
3. Corresponding angles
theorem: If two lines are parallel,
than corresponding angles are
congruent
4. 258 27
5. Substitution