CK-12 Geometry - Second Edition

1.6. Classifying Polygons http://www.ck12.org

TABLE1.2:(continued)

Polygon Name Number of Sides Number of Diagonals Convex Example

Octagon 8?

Nonagon 9?

Decagon 10?

Undecagon or

hendecagon

11?

Dodecagon 12?

n−gon n(wheren>12)?