1. Points, Lines, and Planes
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Line segments, such as KL, are defined only by their endpoints.
LK
KL is the line segment from point K to point L. Let's highlight KL in the diagram.
Line segments are defined only by their endpoints, which are K and L in this case, and have no sort of "direction" of any kind — the order of K and L does not matter when naming the line segment. Therefore, we can give the line segment the alternative name LK.