Write a two-column proof for the following conjuncture. you may not need to use all of the rows of the two-column table provided below. you may also add additional rows if needed given parallelogram abcd
(given 7 columns on assignment)

prove: angle a and angle b are supplementary
angle b and angle c are supplementary.

Statement:                         Reason:

1. line DA = line CB                   1. It is a parallelogram (two sets of parallel lines)

  line DC = line AB

2. m<b + m<c = 180 degrees    2. Same side Interior Angles Theorem

   m<d + m<a = 180 degrees.      (If two parallel lines are cut by a transversal,

                                                      then the same side interior angles are

                                                      supplementary.)