# circumference of circle and area of circle

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## What is Circumference of Circle Calculator?

Circumference of Circle Calculator is an online tool which helps you to calculate the circumference of a circle. Cuemath's circumference of a circle calculator helps you to calculate circumference of a circle with a given radius in a few seconds.

## How to Use the Circumference of Circle Calculator?

• Step 1: Enter the radius of the circle in the given input box.
• Step 2: Click on the "Calculate" button to find the circumference of circle.
• Step 3: Click on the "Reset" button to find the circumference of a circle with different radius.

## How to find the Circumference of a Circle?

Circumference of a circle is defined as the length of boundary of a circle. It is also known as the Perimeter of a circle.

Circumference of a circle = 2πr units

where,'r' is radius of circle and π(Pi) is the mathematical constant with an approximate value of 3.14.

### Solved Example:

Find the circumference of a circle, if the radius is 5 units.

### Solution:

Circumference of circle = 2πr units.

= 2×3.14×5

= 31.4 units

∴ Circumference of the circle = 31.4 units

Similarly, you can try the calculator and find the circumference of circles with the following radius values.

## What is Area of a Circle Calculator?

Cuemath's Area of Circle Calculator is an online tool which helps to calculate the area of a circle. Area of a circle calculator helps you to calculate area of a circle with a given radius with in a few seconds.

## How to Use the Area of a Circle Calculator?

• Step 1: Enter the radius of the circle in the given input box.
• Step 2: Click on the "Calculate" button to find the area.
• Step 3: Click on the "Reset" button to find the area for different values of radius.

## How to Find the Area of Circle?

Area of Circle is defined as amount of space enclosed within the boundary of a circle.

Area of a circle = π rsquare units

where,'r' is radius of circle and π(Pi) is the mathematical constant with an approximate value of 3.14.

### Solved Example:

Find the area of circle if the radius is equal to 7 units.

### Solution:

Area of circle = π r2 square units.

=  3.14× 7×7

=  153.86 square units.

∴ Area of circle   = 153.86 square units.

Similarly, you can try the calculator and find the area of circle which has the following radius.

• 3 units
• 7 units
• 15 units

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