 # Decagon side = 7

## Enter Decagon Info Below

The of a decagon is

The side of an decagon is 7
Calculate perimeter, area

P = 10 x side
P = 10 x 7
P = 70

## Calculate Area:

A = 5/2s25 + 2√5
A = 2.5(7)2(3.0776835371753)
A = 2.5(49)(3.0776835371753)
A = 377.01623330397

## 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

s = 7
P = 70
A = 377.01623330397
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