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?

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 = 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:

Radius (r) = 5 units

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.

  • 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 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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