# Circle Calculator

If you want to determine the circle's area and perimeter or circumference, you can use our circle calculator.

In geometry, the circle is described as a 2-D closed rounded shape where each point of a circle's surface has an equal distance from the center point. At the same time, the distance between the circle's surface and the center of a circle is known as the radius. Whereas a straight line that starts from one point and ends at the opposite point, cutting the circle into two pieces is called the diameter of a circle. It is a double radius.

## Formula of Circle Calculator

If you want to determine the area and circumference of a circle instantly, you can use our calculator, or to determine it manually, you can use the formula listed below:

Area of the circle = A = πr2 Square units
Circumference of the circle = 2πr units

Where,

π = 3.14

r = radius of a circle

### Example

For a more precise understanding of a concept, let us solve an example below:

Suppose the radius of a circle equals 10cm, then find out the area and the circumference of a circle.

Given data

Radius = 10 cm

To Find

Area of a circle = ?
Circumference of a circle = ?

Solution

To find out the area and circumference of a circle, we will use the formula listed below:

Area of the circle = A = πr2 Square units
Circumference of the circle = 2πr units

Putting values in the formula:

Area = 3.14 × (10)2 = 314 cm2
Circumference = 2 × 3.14 × 10 = 62.8 cm

Note:

If you want to make an equation of a circle, you can use our Equation Of A Circle Calculator.

### How to use the Circle Calculator?

The steps to use the circle calculator are as follows:

Step 1: Enter the value of the radius in the required input field.

Step 2: The calculator will automatically display an answer to the area and circumference of a circle on the screen.

### Calculator use

You can use our circle calculator for various mathematical and geometrical principles, such as finding the area or circumference of the ring, tire, camera lenses, cake, buttons, etc.