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Ring (Annulus) formulas
3 formulas for Ring (Annulus), from the Mensuration (2D & 3D) section of the Quantix formula library. Tap 🧮 next to a formula to solve it for any variable with step-by-step working.
| Name | Formula | Note |
|---|---|---|
| Area | A = π(R² − r²) = π(R + r)(R − r) 🧮 Solve step by step | |
| Outer + inner circumference | 2π(R + r) | |
| Width | w = R − r 🧮 Solve step by step |
What the letters mean
| R | outer radius |
| r | inner radius |
Region between two concentric circles (washer, circular path).
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Related: Mensuration (2D & 3D)
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