Stonehenge was built using Pythagoras' theorem
 

http://img-s-msn-com.akamaized.net/t...6&q=60&o=f&l=fThe authors of Megalith say that one of Stonehengeâ??s earliest incarnations, dating from 2750BC, includes a stone rectangle which forms a perfect Pythagorean triangle when split in half.

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