CK-12 Geometry-Concepts

1.12. Polygon Classification http://www.ck12.org

TABLE1.1:(continued)

Polygon Name Number of Sides Number of Diagonals Convex Example

Hexagon 6 9

Heptagon 7 14

Octagon 8?

Nonagon 9?

Decagon 10?

Undecagon or

hendecagon

11?