Circular radius/diameter calculator

1. This tool can calculate the radius and diameter of a circle using either its circumference or its area.

2. Formulas for Calculating Circle Diameter and Radius

(1) Calculating the radius from the area of a circle: r = √(A / π);

(2) Calculating the radius from the area: r = √(A / π);

(3) Calculating the radius from the circumference: r = C / (2π);

(4) Calculating the diameter of a circle using its circumference: d = C / π;

3. Note: The units of the input values determine the units of the output results.

4. Note: The results calculated by this tool are for reference only; for actual applications, please rely on professional equipment.