Home Geometric Calculators German: Geometrierechner
2D Regular Polygons: Equilateral Triangle | Square | Pentagon | Hexagon | Heptagon | Octagon | Nonagon | N-gon
Other Polygons: Triangle | Right Triangle | Isosceles Triangle | Rectangle | Rhombus | Parallelogram | Pentagram | Hexagram
Round Forms: Circle | Ellipse | Circular Sector | Circular Segment | Stadium | Digon
3D Platonic Solids: Tetrahedron | Cube | Octahedron | Dodecahedron | Icosahedron
Other Polyhedrons: Cuboid | Pyramid | Prism | Rhombohedron | Parallelepiped | Truncated Icosahedron
Round Forms: Sphere | Cylinder | Cone | Ellipsoid | Spherical Sector | Spherical Cap | Spherical Wedge | Torus | Capsule



Octagon Calculator

Make calculations in a regular octagon. Enter one value and, when needed, change the number of decimal places. Then click Calculate.

Euclid Edge length (a): Regular octagon
Long diagonal (d):
Medium diagonal (e):
Short diagonal (f):
Perimeter (p):
Area (A):
Excircle radius (re):
Incircle radius (ri):
Round to    decimal places.



Formulas:
d = a * √ 4 + 2 * √2
e = a * ( 1 + √ 2 )
f = a * √ 2 + √2
p = 8 * a
A = 2 * a² * ( 1 + √2 )
re = a / 2 * √ 4 + 2 * √2
ri = a / 2 * ( 1 + √2 )
Angle: 135°

Edge length, diagonal, height, perimeter and radius have the same unit (e.g. meter), the area has this unit squared (e.g. square meter).



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