# Annulus Area Calculator - Calculate the Area of an Annulus

 Radius of the Outer Circle (R) mmcmdmmkmmiinftyd Radius of the Inner Circle (H) mmcmdmmkmmiinftyd
 Area of Annulus (A) = mm²acrearehacm²m²km²ft²in²yd²sqmitwp

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The Annulus Area Calculator is a useful tool for finding the area of an annulus, which is the region between two concentric circles. In this tutorial, we'll show you how to use the calculator and provide you with some examples to help you understand how it works.

## Step 1: Enter the Radii of the Two Circles

The first step is to enter the radii of the two circles that define the annulus into the input boxes on the calculator. Make sure to enter the values in the correct format and with the appropriate units.

## Step 2: Calculate the Area of the Larger Circle

Once you've entered the radii, click the "Calculate Area of Larger Circle" button on the calculator. Our Annulus Area Calculator will then display the area of the larger circle.

A1 = πr12

As you can see from the formula above, the area of a circle is calculated using its radius.

## Step 3: Calculate the Area of the Smaller Circle

Next, click the "Calculate Area of Smaller Circle" button on the calculator. Our Annulus Area Calculator will then display the area of the smaller circle.

A2 = πr22

## Step 4: Calculate the Annulus Area

Once you've calculated the areas of the two circles, click the "Calculate Annulus Area" button on the calculator. Our Annulus Area Calculator will then display the area of the annulus.

A = A1 - A2

As you can see from the formula above, the area of the annulus is calculated by subtracting the area of the smaller circle from the area of the larger circle.

## Examples

Let's look at some examples to see how the Annulus Area Calculator works:

• An annulus with radii of 3 and 5 has an area of 44.18 square units.
• An annulus with radii of 2 and 4 has an area of 37.70 square units.
• An annulus with radii of 6 and 9 has an area of 113.10 square units.

As you can see from these examples, our Annulus Area Calculator can calculate the area of an annulus quickly and accurately.

## Conclusion

The Annulus Area Calculator is a valuable tool for finding the area of an annulus. By following the simple steps outlined in this tutorial, you can quickly and accurately calculate the area of an annulus using the radii of its two defining circles. Try it out for yourself and see how easy it is!

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