In this section we will look at a special type of quadrilateral known as a parallelogram. We will review properties of parallel and perpendicular lines as well as develop an understanding of the angle relationships created by parallel lines and traversals. Parallelograms have unique properties that will help us further explore the concepts of parallel lines and angle relationships, as well.
If we have two parallel lines, let's say m and n, and we "cut" those two lines with another line, t, we call that line a transversal.
Source: MICDS Integrated Mathematics 1 Notes
Source: Geogebra
Source: Geogebra
Source: Geogebra
Source: Geogebra
Source: Geogebra