Geometry
Annulus Area
Area of a ring between two radii.
Formula
Formula
A = π (R2 − r2)
Variables
| Symbol | Definition | Type & range | Units | Role |
|---|---|---|---|---|
| R | outer radius | real number (ℝ) | — | input |
| r | inner radius | real number (ℝ) | — | input |
Try it yourself
Interactive calculator
Worked examples
Example 1
Givenouter R = 5, inner r = 3
Result50.26548246
Example 2
Givenouter R = 10, inner r = 9
Result59.69026042