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A straight line is the shortest distance between two points, a line is the delineation of a connection between two or more points.
A ray has a single start point, and goes on infinitely in one direction. A line segment has two end points and is finite. A line has no end points and goes on infinitely in two directions.
0). Considering any TWO points, you can calculate the slope of the line between them like this: Slope = (difference between the y-values of the two points) divided by (difference between the x-values of the two points). Use this technique to examine your THREE points, like this: 1). Calculate the slope of the line between Point-2 and Point-1. 2). Calculate the slope of the line between Point-3 and Point-1. 3). If the two slopes are equal, then the three points all lie on the same line.
When a line segment connecting two points is horizontal the length of the segment can be found by finding the absolute value of the difference in x-coordinates of the two points.
A line goes on forever and never ends, on either side.A line segmentstops and has two end points.