Circle Area Calculator
Circle Area Formulas
Key formulas:
- Area = π × radius²
- Area = π × (diameter/2)²
- Area = circumference² / (4π)
- Sector Area = (angle/360°) × π × radius²
- Arc Length = (angle/360°) × 2π × radius
Note: For precise calculations, this calculator uses the mathematical constant π (pi) rather than the approximation 3.14. Enter an angle less than 360° to calculate sector area and arc length.