Enter Octagon values

The of an octagon is

The area of an octagon is 9

Calculate side, perimeter

Calculate side:

 s  = √2(1+√2) √A

 s  = √2(2.4142135623731) √9

 s  = √4.8284271247462 √9

 s  = 2.19737 3

s = 0.73245607564521

Calculate Perimeter:

P = 8 x side

P = 8 x 0.73245607564521

P = 5.8596486051617

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

Final Answers

A = 9
s = 0.73245607564521
P = 5.8596486051617
Interior Angle sum = 1080°
Diagonals = 20
1 vertex Diagonals = 5
Triangles = 6
Sides (Edges) = 8
Faces = 1
Vertices = 8

What is the Answer?
A = 9
s = 0.73245607564521
P = 5.8596486051617
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

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