

Line Segment (Coordinate Geometry)
Definition: A straight line which links two points with known
coordinates
without extending beyond them.
Try this
Adjust the line segment below by dragging an orange dot at point A or B and see how the segment
AB behaves. You can also drag the origin point at (0,0).
The location of a line segment on the
coordinate plane
is defined by two endpoints whose
coordinates
are known.
The line links the two endpoints but does not extend beyond them. It is a segment (piece) of a line.
This is the same as the definition of a line segment in ordinary plane geometry,
the only difference being that we know the
coordinates
of the points involved. The naming conventions are also the same.
Things to try
 In the above diagram, press 'Reset'. The line segment AB
starts at point A at (52,7) and ends at point B at (53,20).
 Drag A, B or the origin point and construct various other line segments to get a feel for the concept.
See also the Definition of a Line Segment in plane geometry.
Limitations
In the interest of clarity in the applet above, the coordinates are rounded off to integers and the lengths rounded to one decimal place.
This can cause calculatioons to be slightly off.
For more see
Teaching Notes
Other Coordinate Geometry topics
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