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

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

checking to see if the first layout for a building is 'square'is one. Even a dumbass bricklayer or builder ( I was one once.knows that you can check a corner for squareness by constructing
http://answers.yahoo.com/question/index?qid=200803...
