A line segment is a straight part of a line that has two endpoints. Think of it like a piece of string that starts at one point and ends at another without going on forever.
In maths, you might see a line segment drawn with a letter at each end, like points A and B. If you were to measure the distance between these two points, that would be the length of the line segment.
Line segments are important for understanding shapes, as they help form the sides of polygons like triangles and rectangles.
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