Annulus Calculation
Online calculator and formulas for calculating an annulus
With the annulus calculator on this page, various parameters of an annulus can be calculated. The formulas for the annulus calculation can be found at the bottom of this page.
To perform the calculation, enter the two radii and then click the 'Calculate' button.
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Formulas for calculating an annulus
Area
\(\displaystyle A = π · (R^2-r^2)\)
Perimeter
\(\displaystyle P = 2 · π · (R+r )\)
Breadth
\(\displaystyle b = R-r\)
Interval
\(\displaystyle i = 2 · \sqrt{R^2 - r^2}\)
1D Graphics Functions
Angle between two lines • Angle between two vectors • Center of a straight line • Distance of two points • Distance of a point and a line • Rise over Run • Slope of a line • Straight line equation • Circular arc • Helix • Koch snowflake2D Graphics Functions
Angles
From Degree, Min, Sec to Decimal • From Degree to Percent • Angle sum • Angles from side lengthsTriangles
Bisector of a triangle • Equilateral triangle • Right triangles • Right triangle from 1 side, 1 angle • Isosceles right triangles • Isosceles triangles • Triangle area from 2 sides, 1 angle • Triangle area from 1 side, 2 angles • Triangle, Incircle, given 3 sides • Triangle area given base and height • Triangle vertices, 3 x/y pointsQuadrilateral
Square • Rectangle • Golden Rectangle • Rectangle to Square • Rhombus, given varios parameter • Rhombus area from diagonal e, f • Parallelogram from 2 sides, 1 angle • Parallelogram area from side and height • Cyclic Quadrilateral • General Quadrilateral • Concave Quadrilateral • Arrowhead Quadrilateral • Crossed Square • Frame • Kite • Kite Area from 2 diagonal • Half Square Kite • Right Kite • Symmetrical Trapezoid • Unsymmetrica Trapezoid • Right Angle Trapezoid • Trapezoid-Area • Trapezoid Angle • Tri-equilateral TrapezoidaPolygons
Triangle • Square • Pentagon • Hexagon • Heptagon • Octagon • Nonagon • Decagon • Hendecagon • Dodecagon • Hexadecagon • N-Gon • Polygon ring • Concave hexagon • Axial Symmetric Pentagon • Stretched Hexagon • Stretched Octagon • Pentagram • Hexagram • Octagram • Star of LakshmiCircular
Annulus • Annulus sector • Circle • Circular angles • Circular arcs • Circular sector • Circular segment • Ellipse • Parabolic arch • Squaring the Circle3D Graphics Functions
Angular
Cuboid • Square Pillar • Antiprism • Hexagonal prism • Triangular prism • Regular prism • Oblique prism • Ramp • Anticube • Wedge • Right Wedge • Rhombohedron • Parallelepiped • Tetrahedron, irregular • Tetragonal Trapezohedron • Pentagonal Trapezohedron • Prismatoid • Stellated Octahedron • Stellated Dodecahedron • Great Stellated Dodecahedron • Great DodecahedronPlatonic solids
Tetrahedron • Cube • Octahedron • Dodecahedron • IcosahedronPyramids
Triangular Pyramid • Pyramid • Pentagonal Pyramid • Hexagonal Pyramid • Heptagonal Pyramid • Regular Pyramid • Pyramid, truncated, square • Pyramid, truncated, rectangular • Pyramid Frustum • Triangular Bipyramid • Pentagonal Bipyramid • Hexagonal Bipyramid • Regular Bipyramid • Triangular PyramidArchimedean solids
Cuboctahedron • Icosidodecahedron • Rhombicosidodecahedron • Rhombicuboctahedron • Snub cube • Truncated cube • Snub dodecahedron • Truncated cuboctahedron • Truncated dodecahedron • Truncated icosahedron • Truncated icosidodecahedron • Truncated octahedron • Truncated tetrahedronCatalan solids
Disdyakis Triacontahedron • Deltoidal Hexecontahedron • Deltoidal Icositetrahedron • Hexakis Octahedron • Pentagonal Icositetrahedron • Pentakis Dodecahedron • Rhombic Dodecahedron • Rhombic Triacontahedron • Tetrakis Hexahedron • Triakis Octahedron • Triakis Tetrahedron • Triakis IcosahedronJohnson solids
Square Pyramid • Pentagonal Pyramid • Triangular Cupola • Square Cupola • Pentagonal Cupola • Rotunda • Elongated Triangular Pyramid • Elongated Square Pyramid • Elongated Pentagonal Pyramid • Triangular Bipyramid • Pentagonal Bipyramid • Elongated Square Bipyramid • Gyrobifastigium • Gyroelongated Square Dipyramid • Snub DisphenoidRound solids
Sphere • Spherical cap • Spherical sector • Spherical segment • Spherical ring • Spherical wedge • Spherical corner • Spheroid • Triaxial ellipsoid • Ellipsoid volume • Spherical shell • Solid angles • Torus • Spindle torus • Oloid • Elliptic ParaboloidCones
Cone • Truncated cone • Elliptic cone • Truncated elliptic cone • Bicone • Double cone • Pointed pillar • Rounded coneCylinder
Cylinder • Oblique cylinder • Truncated cylinder • Cylindrical wedge • Hollow cylinder • Half cylinder • Cylindrical sector • Cylindrical segment • Elliptical cylinder • Bicylinder • Tricylinder • Hyperboloid
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