Formula: (n-2)180°
Dodecagon: 12 sides
Heptagon: 7 sides
Decagon: 10 sides
Quadrilateral: 4 sides
Nonagon: 9 sides
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Formula: (n-2)180°
Dodecagon: 12 sides
Heptagon: 7 sides
Decagon: 10 sides
Quadrilateral: 4 sides
Nonagon: 9 sides