Free Annulus Calculator - Calculates the area of an annulus and the equation of the annulus using the radius of the large and small concentric circles.

This calculator has 2 inputs.

This calculator has 2 inputs.

- annulus
- A ring shaped object, bounded by two concentric circles
- circle
- the set of all points in the plane that are a fixed distance from a fixed point
- radius
- Distance from the center of a circle to the edge

C/2π