I believe its because the wafers are actually sliced of a single large crystal of silicon, which grows in a circular cross-section. http://en.wikipedia.org/wik

I believe its because the wafers are actually sliced of a single large crystal of silicon, which grows in a circular cross-section. http://en.wikipedia.org/wiki/Wafer_(electronics) http://en.wikipedia.org/wiki/Wafer_(electronics)