Because 15 is the product of distinct Fermat primes, 3 and 5, a regular polygon with 15 sides is constructible with compass and unmarked straightedge, and cos π / 15 is expressible in terms of square roots (see here).
Define 15. 15 synonyms, 15 pronunciation, 15 translation, English dictionary definition of 15. Noun 1. 15 - the cardinal number that is the sum of fourteen and one fifteen, XV large integer - an integer equal to or greater than ten Adj. 1.
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