Quick answer
A octagon is a polygon with 8 sides.
- Main formula
- Regular perimeter = 8 x side; regular area = (perimeter x apothem)/2.
- Quick example
- If each side measures 4, the perimeter is 32.
Definition
A octagon is a closed polygon formed by 8 line segments.
Regular octagon
In a regular octagon, all sides and all interior angles are equal.
Formulas
- Perimeter of a regular octagon: P = 8s.
- Area of a regular octagon: A = (P x a)/2, where a is the apothem.
Example
If a regular octagon has side length 4, then P = 8 x 4 = 32.