Please read our Privacy Policy . In geometry, lines often occur in pairs. We can use this picture of a box to investigate each of these line pairs. Intersecting lines are lines that have one, and only one, point in common. Look at the line segments formed by the edges of the box and find two line segments that intersect.
Perpendicular lines intersect in a special way, forming right angles.
You'll learn more about right angles in the next lesson. The x and y axes on the coordinate plane are a good example of perpendicular lines. This box has many perpendicular line segments. Parallel lines never touch, and they lie in the same plane. Line segments AE and CG are parallel, and there are also several other sets of parallel edges.