In the figure, ∠6 and ∠3 are same- side interior angles
Same-side interior angles are a pair of angles that lie on the same side of a transversal line intersecting two parallel lines.
When two parallel lines are intersected by a transversal, eight angles are formed at each intersection.
Of these angles, same-side interior angles are located on the same side of the transversal and lie between the two parallel lines.
Note that Consecutive interior angles are supplementary (sum up to 180 degrees).
Alternate interior angles are congruent (have equal measures).