In this lesson, students learn the definition of parallel and perpendicular lines and to recognize them visually.
A set of two lines are defined as parallel if they never cross at any point, no matter how far they are extended. When lines are parallel, the distance between them at all points is the same.
A set of two lines are defined as perpendicular if the angle formed where the two lines intersect is a right angle.
Using these definitions, students learn to identify parallel and perpendicular lines visually. Given two lines, they identify them as parallel, perpendicular, or neither.
In this lesson, students learn to identify parallel and perpendicular lines in figures. For any figure, they are required to indicate how many pairs of lines are parallel and perpendicular.