You've probably heard of intersections when driving. Well, an intersection in geometry is quite similar. An intersection is a point or points that are in two figures at the same time. In the example line D and line E intersect at point O. However, notice the nonintersecting line below. Lines B and G do not intersect because they do not go through each other at plane P. Planes can also intersect each other at a line. Planes Q and R intersect at line L.