Application, Who "Interior angle" redirects here. In illustration one of the example section above, LINE 1 and LINE 2 are parallel and both interior and exterior angles on the same side of the transversal are supplementary. [Figure2] If \begin {align*}l || m\end {align*}, then \begin … So angle 2 and angle 7 are also supplementary same thing with angle 1 and angle 8. So the same side interior angles: have different vertices; lie between two lines; and are on the same side of the transversal; The "same side interior angles" are also known as "co-interior angles." b. Q. ∠5 and ∠8 form a straight line. Since alternate interior and alternate exterior angles are congruent and since linear pairs of angles are supplementary, same side angles are supplementary. website builder. Corresponding Angles: The name does not clearly describe the "location" of these angles.