A line in geometry term looks like a line with to arrows on both sides
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In coordinated geometry the points on a straight line will determine its equation.
There are many different lines in geometry
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