Скачать или смотреть Pairs of Angles Part 7 of 8: Same-Side Interior Angles

In geometry, there are 7 types of important pairs of angles to take note of because they are so common. This is another pair of angles that are formed when two lines are intersected by another line (called the transversal). Same-side interior angles are a pair of angles that are on the same side of the transversal and on the interior of (between) the two lines. Key things to remember: If the lines are parallel, then the same-side interior angles are congruent, and if the same-side interior angles are congruent, then the lines are parallel (it goes both ways).

You’ve probably noticed by now that these names are not random, but actually make a lot of sense if you think about them. And hopefully you’ve also noticed that all of these parallel line theorems go both ways.