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Circle formulas
3 formulas for Circle, 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 = πr² 🧮 Solve step by step | |
| Circumference (perimeter) | C = 2πr = πd 🧮 Solve step by step | |
| Diameter | d = 2r 🧮 Solve step by step |
What the letters mean
| r | radius |
| d | diameter (= 2r) |
All points are at the same distance r from the centre.
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Related: Mensuration (2D & 3D)
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