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
or
.
- 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
open allclose allBasic Examples (4)
Get the Area of an annulus:
Scope (17)
Applications (4)
Properties & Relations (6)
Neat Examples (3)
See Also
Related Guides
Introduced in 2015
(10.2)