Elementary Math Line Segments & Points of Intersection

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You're never too young to start learning about math line segments and points of intersection. Learn about elementary math line segments and points of intersection with help from an experienced mathematics educator in this free video clip.

Part of the Video Series: Elementary Math
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Video Transcript

Hi my name is Marija. I'm a mathematician and today I'm going to talk to you about elementary line segments and points of intersection. So because we're talking about points of intersection I'm going to go ahead and draw a, well one of the quadrants of a coordinate plane, I'm going to draw my X and Y axis and we're going to put some line segments on my graph. So line segments are pieces of lines. So that means that they have boundaries. They don't go on forever like lines, they stop somewhere in the left and somewhere on the right. So I'm going to draw a line segment right here and I know that it has boundaries because it has two endpoints and we'll call these endpoints A and B and I'll draw another line segment going down like this and we'll call this line segment C and D. Again these are line segments because they have endpoints. If it was a line it would go on forever in both directions and it would have arrows to indicate that. So these are my line segments and now when we talk about points of intersection we talk about where these two line segments meet. Where do they hit each other? So I notice that right here at this point these line segments are going to meet. So I'm going to attempt what this point is and 1, 2, 3, 4, it looks like on my graph it's about the point 4,4. Of course I'm estimating because I don't have graph paper on here but I'm reading my coordinates so 1, 2, 3, 4 on the X axis and 1, 2, 3, approximately 4 on the Y axis. It looks like the order pair 4, 4. So 4, 4 is the point of intersection. It's the ordered pair that both of these lines contain. So if I try to start reading all the ordered pairs that are on A, B I would list 4, 4 as one of them and if I tried to list all the ordered pairs on C, D I would also list 4, 4 as one of them because both of them pass through 4, 4. That's the only point that they're going to have in common. So line segments are pieces of lines that have endpoints and a point of intersection is where these two line segments or any other geometric figure meet. My name is Marija and I just told you about elementary line segments and points of intersection.


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