Mathwords: Annulus

(追記) (追記ここまで)

(追記) (追記ここまで)


Annulus
Washer

The region between two concentric circles which have different radii.

Area of annulus \( = \pi \left( {{R^2} - {r^2}} \right)\)

[画像:This is an annulus. It is the region between two concentric circles. The larger circle has radius uppercase R and the smaller has radius lowercase r.]


this page updated 15-jul-23
Mathwords: Terms and Formulas from Algebra I to Calculus
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