Annulus

Annulus[{x,y},{rinner,router}]

represents an annulus centered at {x,y} with inner radius rinner and outer radius router.

Annulus[{x,y},{rinner,router},{θ1,θ2}]

represents an annulus from angle θ1 to θ2.

Details

  • Annulus is also known as a punctured disk.
  • Annulus can be used as a geometric region and a graphics primitive.
  • Annulus[] is equivalent to Annulus[{0,0},{1/2,1}].
  • Annulus[r] is equivalent to Annulus[{0,0},{r/2,r}].
  • Annulus[{rinner,router}] is equivalent to Annulus[{0,0},{rinner,router}].
  • Annulus represents the filled region {p|r_(inner)<=TemplateBox[{{p, -, {{, {x, ,, y}, }}}}, Norm]<=r_(outer)} or {p|r_(inner)<=TemplateBox[{{p, -, {{, {x, ,, y}, }}}}, Norm]<=r_(outer)} intersection Disk[{x,y},r_(outer),{theta_1,theta_2}].
  • Annulus allows and .
  • Angles are measured in radians counterclockwise from the positive x direction.
  • Annulus can be used in Graphics.
  • In graphics, the points {xi,yi} can be Dynamic expressions.
  • Graphics rendering is affected by directives such as FaceForm, EdgeForm, and color.

Examples

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Basic Examples  (4)

The standard annulus:

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An annulus sector:

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Differently styled annuli:

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Get the Area of an annulus:

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The area of an annulus slice:

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Scope  (17)

Applications  (4)

Properties & Relations  (6)

Neat Examples  (3)

See Also

Disk  Circle  Ball  Sphere

Introduced in 2015
(10.2)