Summary
Slopes and Parallel and Perpendicular Lines

Parallel and perpinduclar lines caused by a shadowIn this topic, you have learned what it means when two lines are parallel and perpendicular. Parallel lines will never intersect because they have the same slope. Meanwhile, perpendicular lines will intersect at a 90° angle because their slopes are opposite reciprocals. Parallel and perpendicular lines are everywhere. You will see them again in future modules.