• A 3700-year-old proof that the diagonal of a unit square has length √2 http://www.math.ubc.ca/~cass/Euclid/ybc/ybc.html 23 comments 31/3/2009

• A proof that the diagonal of a unit square is sqrt(2) long - from 3700 BC! http://www.math.ubc.ca/~cass/euclid/ybc/ybc.html 19 comments 1/4/2009 science

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