two dots at ends and draw a line in middle
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A "line" does. A "line segment" does not. Most people interpret "line" to mean "line segment" (without realising it) and so would conclude that a line does not go on forever. A "line segment" is a line between two points, which is what you would draw if told to draw a "line" on a piece of paper.
First of all draw a line segment that is about 2 cm long between two points P0 and P1. At the one of the outer points, draw another line that is at an angle of 90 degrees from the first line segment. This will cause the new line segment to stand straight on the first segment. Draw another line segment between the not used endpoint of the new line segment, let's call it P2, and the not used endpoint of the first line segment. This will create a triangle. Now on the P2 endpoint, draw another line segment that is again at 90 degrees angle. Repeat the previous steps and you will have created a root spiral.
Two points with a single line connecting them.
Draw a line segment with a straight edge.Place protractor on line segment with the center point on the end of the line and the line lined up with the bottom guide.Place a small dot on the 50o mark on the protractor.Place the straight edge on the end of the line segment and on the dot and connect the two.
No. There is exactly one line (and therefore line segment) through any two points.