An undecagon has 11 sides. It is a polygon characterized by having eleven straight edges and vertices. The term "undecagon" is derived from the Latin prefix "undec-" meaning eleven and the Greek word "gonia," meaning angle.
Adecagon.
it has 8 sides
Nine sides.
It has 12 sides
Eight sides.
5 are the sides it has
12 sides
a cube has 6 sides
A Decagon has 10 sides....
4 sides in a rectangle
A heptagon has 7 sides.
6