## Enter Octagon values

The of an octagon is

The perimeter of an octagon is 18

Calculate side, area

##### Calculate side:

 s  = P 8

 s  = 18 8

s = 2.25

##### Calculate Area:

A = 2(1+√2)side2

A = 2(2.4142135623731)2.252

A = 4.8284271247462(5.0625)

A = 24.443912319028

##### Calculate Sum of the Interior Angles:

Interior Angle Sum = (sides - 2) x 180°

Interior Angle Sum = (8 - 2) x 180°

Interior Angle Sum = 6 x 180°

Interior Angle sum = 1080°

##### Calculate polygon diagonals

 Diagonals  = n(n - 3) 2

 Diagonals  = 8(8 - 3) 2

 Diagonals  = 8(5) 2

 Diagonals  = 40 2

Diagonals = 20

##### Calculate 1 vertex diagonals:

1 vertex Diagonals = n - 3

1 vertex Diagonals = 8 - 3

1 vertex Diagonals = 5

##### Calculate triangles from one vertex:

Triangles = N - 2

Triangles = 8 - 2

Triangles = 6

##### Other Properties:

Sides (Edges) = 8

Faces = 1

Vertices = 8

P = 18
s = 2.25
A = 24.443912319028
Interior Angle sum = 1080°
Diagonals = 20
1 vertex Diagonals = 5
Triangles = 6
Sides (Edges) = 8
Faces = 1
Vertices = 8

P = 18
s = 2.25
A = 24.443912319028
Interior Angle sum = 1080°
Diagonals = 20
1 vertex Diagonals = 5
Triangles = 6
Sides (Edges) = 8
Faces = 1
Vertices = 8
##### How does the Octagon Calculator work?
Free Octagon Calculator - Calculate side, area, and perimeter of an octagon based on inputs
This calculator has 1 input.

### What 1 formula is used for the Octagon Calculator?

P = 8*s

For more math formulas, check out our Formula Dossier

### What 5 concepts are covered in the Octagon Calculator?

area
Number of square units covering the shape
octagon
An eight (8) sided polygon
P = 8s
perimeter
The distance around a shape or object
polygon
A plane figure bounded by a set of straight lines
side
line segment joining two vertices in a polygon also known as an edge