Two lines that cannot have a common point are called parallel lines. When two intersecting lines make an angle of 90 degrees, they are called perpendicular lines. When two lines intersect and the angle between them is a right angle, then the lines are said to be perpendicular. In this topic we will learn to clearly differentiate between parallel and perpendicular lines and to draw them.
Do the two lines intersect or stay apart? If they intersect, do they do so thereby creating a 90 degree angle? These are the kinds of questions we ask ourselves when we learn about parallel and perpendicular lines.