3 Given: 21 22; Prove:1 || m
7
2
Complete the two-column proof based on the diagram above and the information given.
Statements
Reasons
1.?
1. 21 22
2.21 23
3.22 23
2.?
3.2
4.1m
4. Corresponding angles
are congruent if lines are
parallel
1. Substitution 2. Vertical angles are congruent 3. Vertical angles are congruent
O 1. Given 2. Vertical angles are congruent 3. Substitution
O 1. Alternate exterior angles are congruent 2. Corresponding angles are congruent 3. Corresponding angles are congruent