Friday, September 23, 2011

Random segments on a grid

Problem: Suppose the endpoints of a line segment are determined by the uniform random selection of two points on a 12 x 12 grid in a square. Now repeat this to randomly determine a second line segment. What is the probability that these two segments cross, i.e. have a point in common?

To Simulate: Move the slider to select speed.

This is a Java Applet created using GeoGebra from - it looks like you don't have Java installed, please go to

Download GGB file at GeoGebra Tube.
More than 50 GeoGebra tutorials at Math and Multimedia

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