Carpentry.
http://wiki.answers.com/Q/How_might_the_Pythagorea...

TV screen sizes. They are always given as the diagonal measure, but if you want to know the actual dimensions, and you know the ratio of sides (16:9 or 4:3) then you can find them
http://answers.yahoo.com/question/index?qid=201307...

Sketch your triangle on paper. It does not need to be exact or to scale, it is just an approximation. The triangle does need to be a right triangle, though. This means that one interior
http://www.ehow.com/how_2072239_usepythagoreanth...

http://pad3.whstatic.com/images/thumb/a/ac/UsethePythagoreanTheoremStep1previewVersion2.jpg/550pxUsethePythagoreanTheoremStep1previewVersion2.jpg
http://www.wikihow.com/UsethePythagoreanTheorem
