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Ellipse (Oval) formulas
2 formulas for Ellipse (Oval), 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 = πab 🧮 Solve step by step | |
| Perimeter (Ramanujan approximation) | P ≈ π[3(a + b) − √((3a + b)(a + 3b))] |
What the letters mean
| a | semi-major axis (half the longest width) |
| b | semi-minor axis (half the shortest width) |
The perimeter of an ellipse has no exact elementary formula; the approximation is very accurate.
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Related: Mensuration (2D & 3D)
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