Enter Octagon values
The side of an octagon is 18
Calculate perimeter, area
Calculate Perimeter:
P = 8 x side
P = 8 x 18
P = 144
Calculate Area:
A = 2(1+√2)side2
A = 2(2.4142135623731)182
A = 4.8284271247462(324)
A = 1564.4103884178
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
s = 18
P = 144
A = 1564.4103884178
Interior Angle sum = 1080°
Diagonals = 20
1 vertex Diagonals = 5
Triangles = 6
Sides (Edges) = 8
Faces = 1
Vertices = 8
You have 1 free calculations remaining
What is the Answer?
s = 18
P = 144
A = 1564.4103884178
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?
What 5 concepts are covered in the Octagon Calculator?
areaNumber of square units covering the shapeoctagonAn eight (8) sided polygonP = 8sperimeterThe distance around a shape or objectpolygonA plane figure bounded by a set of straight linessideline segment joining two vertices in a polygon also known as an edge
Example calculations for the Octagon Calculator
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