Solve for b n^3b-tb= n 3 b−tb= \,\,5g 5g

Given angle 1  and angle 2 are supplementary angles

When two angles are said to be supplementary then the sum of angles = 180 degree

<1 + < 2= 180

Two angles are supplementary angles whose measures sum to 180 degree is a theorem

a theorem can be used as a reason in the second column of a two-column proof

Definition of supplementary angles states that two angles are supplementary angles whose measures sum to 180 degree  

Definition of supplementary angles is the reason should go in box 2, of the two column proof