For a complete lesson on skew lines, go to http://www.MathHelp.com - 1000+ online math lessons featuring a personal math teacher inside every lesson! In this lesson, students learn the definitions of parallel lines, skew lines, parallel planes, and transversals, and are asked to identify these types of lines/planes in given figures. Students are also asked to identify alternate interior angles, same-side interior angles, and corresponding angles. Always, sometimes, and never questions are included in this lesson.