alleryWhich regular polygon is NOT constructible with ruler and compass?
AHexagon
BOctagon
CHeptagon
DDecagon
Answer & Solution
Correct answer: C. Heptagon
1. The constructible list starts 3, 4, 5, 6, 8, 10, 12.
2. Seven sides (the heptagon) is missing from it.
3. The hexagon (6), octagon (8) and decagon (10) all appear.
_Source: Wikipedia, Straightedge and compass construction, section Constructing regular polygons_
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