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Polygons

• Definition and properties of a polygon
• Regular (equiangular, equilateral) Polygons
• Irregular Polygons
• Convex Polygons
• Concave Polygons
• Center of a Polygon
• Central Angle of a Polygon
• Interior Angles
• Exterior Angles
• Interior / Exterior Angles are Supplementary
• Diagonals of a polygon
• Triangles of a polygon
• Apothem of a Polygon
• Radius of a Regular Polygon (circumradius)
• Circumcircle of a Polygon
• Sides of a Regular Polygon
• Incenter of a Regular Polygon
• Incircle of a Regular Polygon

Area and perimeter

• Area of a Regular Polygon
• Area of an Irregular Polygon
• Irregular polygon area calculator
• Perimeter of a Polygon

Triangles (3 sided figures)

• See Triangles Chapter

Quadrilaterals (4 sided figures)

• See Quadrilaterals Chapter

Types of polygons, by number of sides

• Tetragon (4 sides)
• Pentagon (5 sides)
• Hexagon (6 sides)
• Heptagon (7 sides)
• Octagon (8 sides)
• Nonagon (9 sides)
• Decagon (10 sides)
• Undecagon (11 sides)
• Dodecagon (12 sides)

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