The side of an octagon is 3

Calculate perimeter, area

P = 8 x side

P = 8 x 3

P = **24**

A = 2(1+√2)side^{2}

A = 2(2.4142135623731)3^{2}

A = 4.8284271247462(9)

A = **43.455844122716**

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

Interior Angle Sum = (8 - 2) x 180°

Interior Angle Sum = 6 x 180°

Interior Angle sum = 1080°

Diagonals = | n(n - 3) |

2 |

Diagonals = | 8(8 - 3) |

2 |

Diagonals = | 8(5) |

2 |

Diagonals = | 40 |

2 |

Diagonals = **20**

1 vertex Diagonals = n - 3

1 vertex Diagonals = 8 - 3

1 vertex Diagonals = **5**

Triangles = N - 2

Triangles = 8 - 2

Triangles = **6**

Sides (Edges) = **8**

Faces = **1**

Vertices = **8**

s = ** 3**

P =**24**

A =**43.455844122716**

Interior Angle sum = 1080°

Diagonals =**20**

1 vertex Diagonals =**5**

Triangles =**6**

Sides (Edges) =**8**

Faces =**1**

Vertices =**8**

P =

A =

Interior Angle sum = 1080°

Diagonals =

1 vertex Diagonals =

Triangles =

Sides (Edges) =

Faces =

Vertices =

s = ** 3**

P =**24**

A =**43.455844122716**

Interior Angle sum = 1080°

Diagonals =**20**

1 vertex Diagonals =**5**

Triangles =**6**

Sides (Edges) =**8**

Faces =**1**

Vertices =**8**

P =

A =

Interior Angle sum = 1080°

Diagonals =

1 vertex Diagonals =

Triangles =

Sides (Edges) =

Faces =

Vertices =

Free Octagon Calculator - Calculate side, area, and perimeter of an octagon based on inputs

This calculator has 1 input.

This calculator has 1 input.

- 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

- Octagon side = 1
- Octagon area = 1
- Octagon perimeter = 1
- Octagon side = 2
- Octagon area = 2
- Octagon perimeter = 2
- Octagon side = 3
- Octagon area = 3
- Octagon perimeter = 3
- Octagon side = 4
- Octagon area = 4
- Octagon perimeter = 4
- Octagon side = 5
- Octagon area = 5
- Octagon perimeter = 5
- Octagon side = 6
- Octagon area = 6
- Octagon perimeter = 6
- Octagon side = 7
- Octagon area = 7
- Octagon perimeter = 7
- Octagon side = 8
- Octagon area = 8
- Octagon perimeter = 8
- Octagon side = 9
- Octagon area = 9
- Octagon perimeter = 9
- Octagon side = 10
- Octagon area = 10
- Octagon perimeter = 10
- Octagon side = 11
- Octagon area = 11
- Octagon perimeter = 11
- Octagon side = 12
- Octagon area = 12
- Octagon perimeter = 12
- Octagon side = 13
- Octagon area = 13
- Octagon perimeter = 13
- Octagon side = 14
- Octagon area = 14
- Octagon perimeter = 14
- Octagon side = 15
- Octagon area = 15
- Octagon perimeter = 15
- Octagon side = 16
- Octagon area = 16
- Octagon perimeter = 16
- Octagon side = 17
- Octagon area = 17
- Octagon perimeter = 17
- Octagon side = 18
- Octagon area = 18
- Octagon perimeter = 18
- Octagon side = 19
- Octagon area = 19
- Octagon perimeter = 19
- Octagon side = 20
- Octagon area = 20
- Octagon perimeter = 20

Add This Calculator To Your Website