## Enter Decagon Info Below

The of a decagon is

The perimeter of an decagon is 10

Calculate side, area

##### Calculate side:

 s  = P 10

 s  = 10 10

s = 1

##### Calculate Area:

A = 5/2s25 + 2√5

A = 2.5(1)2(3.0776835371753)

A = 2.5(1)(3.0776835371753)

A = 7.6942088429381

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

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

Interior Angle Sum = (10 - 2) x 180°

Interior Angle Sum = 8 x 180°

Interior Angle sum = 1440°

##### Calculate decagon diagonals

 Diagonals  = n(n - 3) 2

 Diagonals  = 10(10 - 3) 2

 Diagonals  = 10(7) 2

 Diagonals  = 70 2

Diagonals = 35

##### Calculate diagonals from 1 vertex:

1 vertex Diagonals = n - 3

1 vertex Diagonals = 10 - 3

1 vertex Diagonals = 7

##### Calculate number of Δ from 1 vertex:

Triangles = N - 2

Triangles = 10 - 2

Triangles = 8

##### Other Properties:

Sides (Edges) = 10

Faces = 1

Vertices = 10

P = 10
A = 7.6942088429381
Sides (Edges) = 10
Faces = 1
Vertices = 10

P = 10
A = 7.6942088429381
Sides (Edges) = 10
Faces = 1
Vertices = 10
##### How does the Decagon Calculator work?
Free Decagon Calculator - Solves for the side, perimeter, and area of a decagon.
This calculator has 1 input.

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

P=10s

For more math formulas, check out our Formula Dossier

### What 4 concepts are covered in the Decagon Calculator?

area
Number of square units covering the shape
decagon
10 sided polygon or 10-gon
perimeter
The distance around a shape or object
side
line segment joining two vertices in a polygon also known as an edge