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Lesson 81: Parallel and Perpendicular Lines
In this very easy lesson, we'll take a look at two arrangements of lines which come up very frequently in math.
Take a look at the first set of lines below. The lines on the left are called parallel. All that means is that if they were to be extended forever, they would never intersect. They will always be the exact same distance apart.
The lines on the right are called perpendicular. They intersect at a right angle, which you've seen before. The little square is just a way of showing us that they form a right angle. Even if each line was rotated, they would still be perpendicular, as long as they intersected at a right angle. They don't necessarily have to be vertical and horizontal.
Later you will learn much more about how these lines are used in math, but for now, be sure to memorize these definitions.
Remember that you can ask a math question if you have additional questions about a topic, or you can contact me if you have any comments or suggestions for this site.