Circumference Calculator | Math Goodies

Use our Circumference Calculator to determine the circumference of a circle.

Does calculating circumference have you running in circles ? Our circumference calculator is an easily manner for you to find the circumference of any circular object. Simply enter the radius of the r-2 and hit “ calculate. ” You can click the “ reset ” button if you need to clear the circumference calculator in regulate to find the answer for another circle .

Try our Circumference Calculator now!

Enter the radius of the circle:
The circumference of this circle is:  

And if you ‘re not certain what the radius is or how to find it, we ‘ll walk you through some of the basics of finding a traffic circle ‘s circumference below .

What is the Circumference of a Circle?

The circumference of a r-2 is the measurement around a lap ‘s edge. It can be compared to finding the margin of a shape ( although the parole circumference is reserved specifically for polygons ). If you were to cut a r-2 and lay the sketch flat, the length of the occupation it created would be its circumference. The circumference can be measured in any whole or system that traditionally measures length – imperial ( inches, feet, etc. ) or metric function ( centimeters, meters, and so forth ). Whichever whole the radius is measured in will besides be the unit the circumference is calculated in .
The equality used to find circumference is C = 2Πr, where C stands for circumference, R stands for radius, and Π is Pi, a mathematical ceaseless equivalent to approximately 3.14 ( see more below ).

You can besides calculate the circumference of a circle using the diameter, with the equation C = Π * d. If you only have the diameter of a circle and would however like to use this calculator, you can find the radius by dividing the diameter in half .
We suggest working out some problems on your own and using the calculator to check your answer, as it provides you with a solution for each trouble but will not show you the work that goes with it .

Parts of a Circle

  • Circumference: The distance once around the circle. It can also be understood as the circle’s perimeter.
  • Radius: The distance from the center of the circle to its edge. No matter which direction you measure in, the radius will be the same from any point on the edge of the circle.
  • Diameter: A straight line across the circle that intersects through the center point. This measurement is always equal to twice the radius (2r). 

The Value of Pi

Pi ( Π ) is a non-terminating number, which means it goes on constantly and has no end. Its value is about 3.1415926535897…  Pi is besides a constant, which means it is constantly peer to the same value .
The greek letter p ( pronounced as “ proto-indo european ” ) is used to describe this number. It stands for the ratio between the circumference of any circle and its diameter, and it ‘s true for all circles. This means that any set ’ mho circumference will be about 3.14 times the length of its diameter .

Circumference Equation Example

What is the circumference of a circle whose radius is 24 inches ?

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Circumference = 2×Π×r
C = 2 × 3.14 × 24
C = 150.79 inches
When you enter the radius of 24 into our calculator, it provides you with an answer of 150.79644737231007, which is a more accurate answer. This is because it uses a more accurate number for Pi, rather than rounding to 3.14.

Our circumference calculator provides circumference of a lap by entering its radius. Our circumference calculator is barren to use any meter you want to determine the circumference of a r-2 !
We besides have a fun instructional video on diameter, radius and circumference of a r-2 correctly here : circumference of a Circle Video .
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