The area of a nonagon is 3

Calculate side, perimeter

Calculate side:

A = 9/4s2cot(180°/9)

s2  =  4A
  9cot(180°/9)

s2  =  4 x 3
  9cot(20)

s2  =  12
  9 x 2.7474774228644

s2  =  12
  24.727296805779

s2 = 0.485293645086

s = √0.485293645086

s = 0.69663020684291

Calculate Perimeter:

P = 9 x side

P = 9 x 0.69663020684291

P = 6.2696718615862

Calculate Sum of the Interior Angles:

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

Interior Angle Sum = (9 - 2) x 180°

Interior Angle Sum = 7 x 180°

Interior Angle sum = 1260°

Calculate polygon diagonals

Diagonals  =  n(n - 3)
  2

Diagonals  =  9(9 - 3)
  2

Diagonals  =  9(6)
  2

Diagonals  =  54
  2

Diagonals = 27

Calculate 1 vertex diagonals:

1 vertex Diagonals = n - 3

1 vertex Diagonals = 9 - 3

1 vertex Diagonals = 6

Calculate triangles from one vertex:

Triangles = N - 2

Triangles = 9 - 2

Triangles = 7

Other Properties:

Sides (Edges) = 9

Faces = 1

Vertices = 9

Final Answers


A = 3
s = 0.69663020684291
P = 6.2696718615862
Interior Angle sum = 1260°
Diagonals = 27
1 vertex Diagonals = 6
Triangles = 7
Sides (Edges) = 9
Faces = 1
Vertices = 9


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What is the Answer?
A = 3
s = 0.69663020684291
P = 6.2696718615862
Interior Angle sum = 1260°
Diagonals = 27
1 vertex Diagonals = 6
Triangles = 7
Sides (Edges) = 9
Faces = 1
Vertices = 9
How does the Nonagon Calculator work?
Free Nonagon Calculator - Calculates the side, perimeter, and area of a nonagon
This calculator has 1 input.
What 1 formula is used for the Nonagon Calculator?
P = 9s
What 5 concepts are covered in the Nonagon Calculator?
area
Number of square units covering the shape
nonagon
9 sided polygon or 9-gon
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
Example calculations for the Nonagon Calculator

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