Triangle (3 sides) - 120°, Quadrilateral (4 sides) - 90°, Pentagon (5 sides) - 72°, Hexagon (6 sides) - 60°, Heptagon (7 sides) - 51.4°, Octagon (8 sides) - 45°, Nonagon (9 sides) - 40°, Decagon (10 sides) - 36°, Undecagon (11 sides) - 32.7°, Dodecagon (12 sides) - 30°,

1.4 Geometrical reasoning - Angles in polygons - Size of exterior angle

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