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`Annulus -- from Wolfram MathWorld
`
`Geometry › Plane Geometry › Circles ›
`Geometry › Plane Geometry › Laminae ›
`History and Terminology › Wolfram Language Commands ›
`Annulus
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`The region lying between two concentric circles. The area of the annulus formed by two circles of
`radii
` and
` (with
`) is
`
`The annulus is implemented in the Wolfram Language as Annulus[ x, y , b, a ].
`
`In the above figure, the area of the circle whose diameter is tangent to the inner circle and has
`endpoints at the outer circle is equal to the area of the annulus.
`
`SEE ALSO
`Annulus Theorem, Bullseye Illusion, Chord, Circle, Concentric Circles, Lune, Spherical Shell
`
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`Annulus -- from Wolfram MathWorld
`
`annulus
`
`More things to try:
`
`= annulus
`
`= (1+e)/2
`
`= corners |x^3 - 2x^2 - 16x + 6|
`
`REFERENCES
`Harris, J. W. and Stocker, H. "Annulus, Circular Ring." §3.8.3 in Handbook of Mathematics and Computational
`Science. New York: Springer-Verlag, p. 91, 1998.
`
`Pappas, T. "The Amazing Trick." The Joy of Mathematics. San Carlos, CA: Wide World Publ./Tetra, p. 69, 1989.
`
`CITE THIS AS:
`Weisstein, Eric W. "Annulus." From MathWorld--A Wolfram Web Resource.
`https://mathworld.wolfram.com/Annulus.html
`
`SUBJECT CLASSIFICATIONS
`
`Geometry › Plane Geometry › Circles ›
`Geometry › Plane Geometry › Laminae ›
`History and Terminology › Wolfram Language Commands ›
`
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`Created, developed and nurtured by Eric Weisstein at Wolfram Research
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`https://mathworld.wolfram.com/Annulus.html
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