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The Side of an octagon is 18
Calculate perimeter, area
P = 8 x side
P = 8 x 18
P = 144
A = 2(1+√2)side2
A = 2(2.4142135623731)182
A = 4.8284271247462(324)
A = 1564.4103884178
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