1. Contains an infinite number of points
2. can be used to create other geometric shapes
3. is a term that does not have a formal definition
In Geometry, unless it's stated, a line will extend in one dimension and goes on forever in both ways.
This would not mean that K and L will always be together. It just implies that, if K is there, then L will also be there.
At the same time, it can happen that L is there but K isn't.
Remember, the condition is on K, not on L.
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