Circumference Calculator


How to use a circumference calculator?

To use the circumference calculator, follow the steps below.

  1. Enter the radius in cm into the input box.
  2. Click the calculate button
  3. Hit the reset button to enter new values.




x1 = 15, x2 = 12, y1 = 12, y2 = 18


Ax + By + C = 0 ---- (i)


Now Put all values in equ (i)

Circumference calculator

A circumference calculator is used to evaluate the circumference and the area of a circle with steps in a couple of a second. This calculator only takes the radius and will calculate the circumference and circle area according to their formulas.

What is the circumference of the circle?

In geometry, the circumference is the linear distance of the paths that make circles. It is generally the perimeter of an ellipse or circle. The term perimeter is frequently used in polygons to calculate the results.

Formula of circumference and circle area

For circumference

The formula of the circumference is:

Circumference = 2πr

For the area of a circle

The formula of the area of a circle is:

Area = πr2

How to calculate the circumference of a circle?

To solve the circumference of a circle, use the above circumference calculator. Here is an example of calculating the circumference of a circle manually.


Calculate the circumference and area of a circle if the radius of a circle is 12cm


Step 1: Take the formula of circumference and substitute the given values to it.

Circumference = 2πr

Radius = r = 12cm

Pi = π = 3.14

Circumference = 2(3.14) (12)

Circumference = 75.36 cm

Step 2: Take the formula of the area of a circle and substitute the given values to it.

Area = πr2

Radius = r = 12cm

Pi = π = 3.14

Area = (3.14) (12)2

Area = (3.14) (144)

Area = 452.16 cm2


The area of the circle is 452.16 cm2 and the circumference of the circle is 75.36 cm.




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