The Perimeter of an decagon is 8
Calculate side, area
Calculate side:
| s = | P |
| 10 |
| s = | 8 |
| 10 |
s = 0.8
Calculate Area:
A = 5/2s2√5 + 2√5
A = 2.5(0.8)2(3.0776835371753)
A = 2.5(0.64)(3.0776835371753)
A = 4.9242936594804
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 = 8
A = 4.9242936594804
Sides (Edges) = 10
Faces = 1
Vertices = 10
A = 4.9242936594804
Sides (Edges) = 10
Faces = 1
Vertices = 10
