Use this fact: A positive integer n ≥ 3 is constructive if it is possible to construct a regular n-gon by straightedge and compass, it is possible to construct the angle 2π/n. And that if both angles α and β can be constructed by straightedge and compass then so are their sums and differences.The outside angle of a regular n-gon is 2π/n
Suppose px is constructive where p is an odd prime. Prove x≤1.
(Abstract Algebra)
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