alleryHow many Fermat primes are known?
AThree
BFive
CSeven
DNine
Answer & Solution
Correct answer: B. Five
1. Only five Fermat primes are known.
2. They decide which regular polygons with an odd number of sides are constructible.
3. That gives known 31 odd-sided constructible polygons.
_Source: Wikipedia, Straightedge and compass construction, section Constructing regular polygons_
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