What Are Concurrent Lines? - Definition & Examples

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• 0:02 Background on Concurrent Lines
• 1:04 Definition of Concurrent Lines
• 1:40 What About Parallel Lines?
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Lesson Transcript
Instructor: Allison Petrovic

Allison has experience teaching high school and college mathematics and has a master's degree in mathematics education.

Lines that all meet at a point have a very special name. The point where all of those lines meet also has a special name. In this lesson we'll learn all about concurrent lines and how they intersect.

Background on Concurrent Lines

Think about the last time you saw a spider web. The thought of it may give you the chills! Think about what a spider web looks like. It has many strings that meet in the middle, right? All of the strings make what you can call concurrent lines. But, before you learn all about concurrent lines, it's important that you understand all about the word intersection.

When you're in the car with your family or friends, did you ever hear the word 'intersection'? On the road, an intersection is when two or more roads meet. You will most likely see either a traffic light or a stop sign at an intersection. Now, in math, an intersection is when two or more lines meet at one point. This picture shows two lines.

The purple line is Line 1 and the orange line is Line 2. Do you also see a point on this picture? The point in this picture is named point a. See how the purple line and orange line both cross at point a. Using the new word 'intersection', you can say that Line 1 and Line 2 intersect at point a.

Definition of Concurrent Lines

Now, let's talk all about concurrent lines. Concurrent lines are the lines that all intersect at one point. The point where all the concurrent lines meet has a special name. You can call it the point of concurrency. Now, take a look at the picture that's on your screen.

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