8 more.
A dodecagon has 12 sides. A quadrilateral has 4 sides.
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8 sides
12 - 9 = 3.
Triangle has 3 sides Quadrilateral has 4 sides Pentagon has 5 sides Hexagon has 6 sides Heptagon has 7 sides Octagon has 8 sides Nonagon has 9 sides Decagon has 10 Undecagon has 11 sides Dodecagon has 12 sides And there are many more because polygon means many sides
12 - 9 = 3
One more side.