Contractibility of Regular Polygons, from Euclid to Gauss

Therefore, and are roots to the following quadratic equation:, or . By the quadratic formula, Since > , and . This gives us that . and . While the expression seems to be daunting, it is comprised only of sums, differences, products, quotients, and square roots, making it a constructible number. ................
................

In order to avoid copyright disputes, this page is only a partial summary.