Match the reasons with the statements.

The given line l and m are parallel.

The proof is given below

Step-by-step explanation:

It is given that two lines l and m are parallel.m<1= m<2

To prove l parallel m

1). m<1 = m<2                  -  given

2). m<1 = m<3                  -  Vertical angles are equal

3).m<2 = m<3                   -  Substitution

4). l ║m                             - If corresponding angles are equal then the lines          

                                                   are parallel.

Hence the proof

72 is the answer to this problem