alleryThe angle 2 pi over N can be trisected if and only if what holds?
AN equals exactly 3
BN is a multiple of 3
CN is an odd number
D3 does not divide N
Answer & Solution
Correct answer: D. 3 does not divide N
1. Trisectible exactly when 3 does not divide N.
2. So N = 4 or N = 5 gives trisectible angles; N = 3 or 9 does not.
3. Being odd is not the deciding test.
_Source: Wikipedia, Angle trisection, section Angles which can be trisected_
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