this is why i dropped maths

http://www.jimloy.com/geometry/pentagon.htm

http://library.thinkquest.org/27890/applications6.html

http://en.wikipedia.org/wiki/Modulor

http://www.geocities.com/robinhuiscool/constructingasquare.html

http://www.anselm.edu/homepage/dbanach/pyth4.htm