Octagon area = 14

The of an octagon is

The area of an octagon is 14. Calculate side, perimeter

Calculate side:
s =2(1+√2)
A

s =2(2.1)
14

s =4.2
14

s =2.6
3.9

s = 0.72

Calculate Perimeter:
P = 8 x side
P = 8 x 0.72
P = 4.7

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 the number of diagonals of the polygon:
Diagonals =n(n - 3)
2

Diagonals =8(8 - 3)
2

Diagonals =8(5)
2

Diagonals =40
2

Diagonals = 20

Calculate the number of diagonals from one vertex:
1 vertex Diagonals = n - 3
1 vertex Diagonals = 8 - 3
1 vertex Diagonals = 5

Calculate the number of triangles that can be drawn from one vertex:
Triangles = N - 2
Triangles = 8 - 2
Triangles = 6