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# Annulus calculator

An annulus calculator is a tool that is used to calculate the area and perimeter of an annulus. An annulus is a geometric shape that is formed by taking a circle and removing a smaller circle from the center of the larger circle, leaving a ring-shaped figure. The annulus calculator requires the user to input the values of the outer radius (R) and the inner radius (r) of the annulus.

Enter Information

Enter Information:

Results
Fill the calculator form and click on Calculate button to get result here
Calculation
The area of an annulus can be calculated using the following formula:

A = π(R^2 - r^2)

Where:

A is the area of the annulus
π is the mathematical constant pi (approximately equal to 3.14)
R is the outer radius of the annulus
r is the inner radius of the annulus
The perimeter of an annulus can be calculated using the following formula:

P = 2π(R + r)
Where:
P is the perimeter of the annulus
π is the mathematical constant pi (approximately equal to 3.14)
R is the outer radius of the annulus
r is the inner radius of the annulus

## What is Annulus calculator

An annulus calculator is a tool used to calculate the area, perimeter, and other properties of an annulus. An annulus is a two-dimensional geometric shape consisting of two concentric circles, where the area between the two circles is shaded. It is also sometimes referred to as a ring.

To use an annulus calculator, you will typically need to input certain dimensions, such as the inner and outer radii or diameter of the annulus. Based on these dimensions, the calculator will then perform calculations to determine various properties of the annulus, such as its area, perimeter, and circumference.

An annulus calculator can be useful in a variety of applications, such as in geometry classes or when designing objects that involve annular shapes, such as rings or gears. By using an annulus calculator, you can quickly and easily determine the various properties of an annulus, without having to perform complex mathematical calculations manually.

## Guide of Annulus calculator and example

1. Determine the dimensions of the annulus you want to calculate. You need to know either the radii or the diameter of both circles that define the annulus. For this example, let’s assume that the inner radius of the annulus is 3 cm and the outer radius is 6 cm.
2. Open an Annulus Calculator on your device. There are several online calculators available, such as Omni Calculator, Calculator.net, and others. You can also use a scientific calculator if you know the formulas.
3. Enter the value of the inner radius of the annulus. In this example, we will enter “3” in the appropriate field.
4. Enter the value of the outer radius of the annulus. In this example, we will enter “6” in the appropriate field.
5. Click or tap the “Calculate” button on the calculator. The calculator will perform the necessary calculations based on the radii you entered.
6. The calculator will display various properties of the annulus. For example, it may display the following:
• Area: 84.78 square centimeters
• Perimeter: 31.42 centimeters
• Circumference of the outer circle: 37.7 centimeters
• Arc length of the outer circle: 23.8 centimeters
1. You can use the results for your calculations, or simply make note of them for your records.

In summary, to use an Annulus Calculator, you need to know the dimensions of the annulus, enter them into the calculator, and click or tap the “Calculate” button. The calculator will then display various properties of the annulus, which you can use for your calculations or record-keeping.

Annulus calculators can be used for various applications, such as in math classes, engineering, or designing objects with annular shapes.