The Math behind soccer/ football

Hi Everyone,

I saw this online and thought it was pretty cool: http://www.dpaonthenet.net/article/51118/When-is-a-goal-not-a-goal--Mathcad-measures-up.aspx its an article all about whether or not a goal should be counted in soccer/ football if it bounces of the crossbar. And, all the Math behind the problem is done in Mathcad! Pretty cool, huh?