About Circle Calculator
Calculate various properties of a circle using its radius. This calculator provides the area, circumference, and diameter of a circle instantly.
Formulas
- Area: π × r²
- Circumference: 2 × π × r
- Diameter: 2 × r
How to Use
- Enter the radius of the circle
- Click Calculate
- View the area, circumference, and diameter
Example
For a circle with radius = 5:
- Area = π × 5² = 78.5398 square units
- Circumference = 2 × π × 5 = 31.4159 units
- Diameter = 2 × 5 = 10 units