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Home | Forms | Contact & Privacy Geometric Calculators German: Geometrierechner

2D Regular Polygons:
Equilateral Triangle, Square, Pentagon, Hexagon, Heptagon, Octagon, Nonagon, Decagon, Hendecagon, Dodecagon, N-gon

Other Polygons:
Triangle, Right Triangle, Isosceles Triangle, IR Triangle, Rectangle, Rhombus, Parallelogram, Kite, Isosceles Trapezoid, Trapezoid, Cyclic Quadrilateral, Tangential Quadrilateral, Arrowhead, House-Shape, Concave Pentagon, Threestar, Fourstar, Pentagram, Hexagram, Star of Lakshmi

Round Forms:
Circle, Semicircle, Circular Sector, Circular Segment, Round Corner, Annulus, Annulus Sector, Ellipse, Stadium, Digon, Spherical Triangle, Reuleaux Triangle, Astroid, Hypocycloid, Cardioid, Parabolic Segment, Arbelos, Salinon, Lune, Three Circles, Lemniscate, Squircle
3D Platonic Solids:
Tetrahedron, Cube, Octahedron, Dodecahedron, Icosahedron

Archimedean Solids:
Truncated Tetrahedron, Cuboctahedron, Truncated Cube, Truncated Octahedron, Rhombicuboctahedron, Icosidodecahedron, Truncated Dodecahedron, Truncated Icosahedron

Catalan Solids:
Triakis Tetrahedron, Rhombic Dodecahedron, Tetrakis Hexahedron, Rhombic Triacontahedron

Other Polyhedrons:
Cuboid, Square Pillar, Square Pyramid, Regular Pyramid, Pyramid, Regular Frustum, Frustum, Bipyramid, Ramp, Right Wedge, Wedge, Rhombohedron, Parallelepiped, Prism, Antiprism, Trapezohedron, Cupolae, Disphenoid, Corner, Truncated Rhombohedron, Stellated Octahedron, Small Stellated Dodecahedron

Round Forms:
Sphere, Hemisphere, Cylinder, Cut Cylinder, Oblique Cylinder, Generalized Cylinder, Cone, Truncated Cone, Spheroid, Ellipsoid, Spherical Sector, Spherical Cap, Spherical Segment, Spherical Wedge, Cylindrical Wedge, Cylindrical Sector, Cylindrical Segment, Cylindrical Shell, Spherical Ring, Torus, Capsule, Lens, Paraboloid, Oloid, Steinmetz Solids


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Octagon Calculator

Make calculations in a regular octagon (8 vertices). This form is familiar from being used as stop sign. Enter one value and choose 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):
Circumcircle radius (rc):
Incircle radius (ri):
Round to    decimal places.



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

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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