Edit made on October 23, 2008 by ColinWright at 09:45:23
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A Golden Rectangle is a rectangle whose sides are in the golden
That means that if you chop off the largest square possible, the
remaining rectangle is also golden. The Golden Ratio is found all over the
pentagon, so perhaps it's no surprise that the Golden Rectangle can be found
in the dodecahedron.
Compare with A4 paper.
See also: Paper dodecahedron.