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I would like to use something from Euclid's elements. I would like it to be a geometric proof - but what is the most "audience friendly?" I need to be able to do it in a very short amount of time. (We have less than 10 minutes for our entire presentation, and the proof cannot take up the bulk of it).

I'm thinking Proposition 13 "If a straight line stands on a straight line, then it makes either two right angles or angles whose sum equals two right angles."

Ideas? I can have fun with this one...

-Dave K