Complete the proof for theorem 3-13. 1. l||m if lines are ||, corresponding angles are equal. 2. m∠1 = m∠3 vertical angles are equal. 3. m∠2 = m∠3 given 4. m∠1 = m∠2 substitution

To find the proof of this theorem, you need to match column a to column b.

The given are the following:

This would be column a:

1. l||m

2. m∠1 = m∠3

3. m∠2 = m∠3

4. m∠1 = m∠2

This would be column b:

a. If lines are ||, corresponding angles are equal.

b. given

c. substitution

d. Vertical angles are equal.

The theorem is asking us to prove that m1 = m2. So the answers would be:

1. Would be b because that is the given for the theorem.

2. The answer is a.

3. The answer is d.

4. The answer is c.