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Intersecting Line Segments

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This Demonstration determines whether or not two line segments intersect. A green dot indicates that the segments intersect and a red dot that they do not. Degeneracy (i.e., when the lines are parallel or coincident) is shown with a red dot in the middle of the screen.

Contributed by: Jon Perry (September 2009)
Open content licensed under CC BY-NC-SA

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For details, see:

P. Bourke, "Intersection Point of Two Lines (2 Dimensions)." (April 1989)

Wikipedia, "Line-Line Intersection."

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