# circumference of circle and area of circle

## 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?

Please follow below steps to find circumference of circle:

**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 = 2 πr 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:**

Radius (r) = 5 units

Circumference of circle = 2*πr* 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.

- Radius = 7 units
- Radius = 11 units
- Radius = 8 units

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## 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?

Please follow below steps to find the area of circle:

**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 r^{2 }square 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* r^{2} 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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