12 - 9 = 3.
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hexagon, heptagon, octagon, nonagon, decagon, undecagon, dodecagon .... etc
A nonagon has nine sides and a pentagon has five, so four more sides....
I think it is 4! :} * * * * * You think wrong! A dodecagon has 12 sides, a pentagon has 5. So a dodecagon has 7 more sides.
4 more sides
It has: 12-3 = 9 more sides