There are many different lines in geometry
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A line in geometry term looks like a line with to arrows on both sides
In coordinated geometry the points on a straight line will determine its equation.
euclidean Geometry where the parallel line postulate exists. and the is also eliptic geometry where the parallel line postulate does not exist.
Angles on a straight line add up to 180 degrees in geometry.
Point ; Line ; Plane - Remember the Point-Line-Plane Postulate