Octagon
An octagon or 8-gon is a shape with 8 sides and 8 corners.
Regular octagon[change | change source]
All sides of a regular octagon are the same length. Each corner is 135°. All corners added together equal 1080°.
Area[change | change source]
The amount of space a regular octagon takes up is
a is the length of one of its sides.
Another way to write it is
Gallery[change | change source]
This shape is called an octagram. It has one regular octagon in the middle.
The octagonal prism has 2 octagons in it: one on the top, and the other on the bottom.
A non-regular octagon
Making an octagon by folding paper
Related pages[change | change source]
Special cases, including regular polygons with their own names, in parentheses List of polygons by number of sides | ||
| 1–10 sides |  | |
| 11–20 sides | ||
| 21–30 sides | ||
| 31–40 sides | ||
| 41–50 sides | ||
| 51–100 sides (selected) | ||
| Star polygons (5–12 sides) | ||
| >100 sides | ||
| Triangles | ||
| Quadrilaterals | ||