# How to find approximate circumference

## Circumference Calculator

### Circumference Calculation Explained

Understanding what a circumference of a circle is and how to calculate it is crucial as you move to higher level math. In this article you will learn the answers to the following questions.

• What is the circumference of a circle?
• How can you calculate the circumference of a circle?

### What is the circumference of a circle?

The circumference of a circle is the distance around the outside of the circle. It is like the perimeter of other shapes like squares. You can think of it as the line that defines the shape. For shapes made of straight edges this line is called the perimeter but for circles this defining line is called the circumference.

This diagram shows the circumference of a circle.

There are two other important distances on a circle, the radius (r) and the diameter(d). The radius, the diameter, and the circumference are the three defining aspects of every circle. Given the radius or diameter and pi you can calculate the circumference. The diameter is the distance from one side of the circle to the other at its widest points. The diameter will always pass through the center of the circle. The radius is half of this distance. You can also think of the radius as the distance between the center of the circle and its edge.

This diagram shows the circumference, diameter, center, and radius on a circle.

### How can you calculate the circumference of a circle?

If you know the diameter or radius of a circle, you can work out the circumference. To begin with, remember that pi is an irrational number written with the symbol π.  π is roughly equal to 3.14.

The formula for working out the circumference of a circle is:

Circumference of circle = π x Diameter of circle

This is typically written as C = πd. This tells us that the circumference of the circle is three “and a bit” times as long as the diameter. We can see this on the graphic below:

You can also work out the circumference of a circle if you know its radius. Remember that the diameter is double the length of the radius. We already know that C = πd. If r is the radius of the circle, then d = 2r. So, C = 2πr.

### Example 1

If a circle has a diameter of 10cm, what is its circumference?

We know that C = πd. Since the diameter is 10cm, we know that C = π x 10cm = 31.42cm (to 2 decimal places).

### Example 2

If a circle has a radius of 3m, what is its circumference?

We know that C = 2πr. Since the radius is 3m, we know that C = π x 6m  = C= 18.84m (to 2 decimal places).

### Example 3

Find the missing length (marked with a ?) on the diagram below:

The missing length is the circumference. Using the knowledge that the diameter is 4.3m on the diagram and knowing that C = πd, we can calculate the circumference. With a little thinking we can easily figure out that, C = π x 4.3m = 13.51m (to 2 decimal places). The missing length is 13.51m.

### How to calculate the circumference of the Earth

Have you ever wondered how big the earth is? Well, using pi it’s possible to work out the circumference of the Earth! Scientists have discovered that the diameter of the Earth is 12,742km. Given this information, what is the circumference of the Earth? Get out a piece of paper and a calculator and see if you can work it out on your own.

Again, we know that C = πd, and that the diameter of the earth is 12,742km. Using this information we can calculate the circumference of the Earth as C = π x 12,742km = 40,030km.

### Formula for the Circumference and Area of a Circle

Sours: https://www.piday.org/calculators/circumference-calculator/

## How To: Calculate the circumference of a circle

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## Circumference Calculator

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

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

### Try our Circumference Calculator now!

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

### What is the Circumference of a Circle?

The circumference of a circle is the measurement around a circle's edge. It can be compared to finding the perimeter of a shape (although the word perimeter is reserved specifically for polygons). If you were to cut a circle and lay the outline flat, the length of the line it created would be its circumference. The circumference can be measured in any unit or system that traditionally measures length - imperial (inches, feet, etc.) or metric (centimeters, meters, etc.). Whichever unit the radius is measured in will also be the unit the circumference is calculated in.

The equation used to find circumference is C = 2Πr, where C stands for circumference, R stands for radius, and Π is Pi, a mathematical constant equivalent to approximately 3.14 (see more below).

You can also 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 still 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 problem 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 forever and has no end. Its value is about 3.1415926535897... Pi is also a constant, which means it is always equal to the same value.

The Greek letter p (pronounced as "pie") 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 circle’s 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?

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 precise 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 circle by entering its radius.  Our circumference calculator is free to use any time you want to determine the circumference of a circle!

We also have a fun instructional video on diameter, radius and circumference of a circle right here: Circumference of a Circle Video .

Other Calculators

Sours: https://www.mathgoodies.com/calculators/circumference-calculator
Finding the Area of a Circle (exact vs approximate answer)

## How do you find the approximate circumference of a circle?

The circumference of a circle can be found by multiplying pi ( π = 3.14 ) by the diameter of the circle. If a circle has a diameter of 4, its circumference is 3.14*4=12.56. If you know the radius, the diameter is twice as large.

Considering this, how do you find the approximate circumference?

The circumference = π x the diameter of the circle (Pi multiplied by the diameter of the circle). Simply divide the circumference by π and you will have the length of the diameter. The diameter is just the radius times two, so divide the diameter by two and you will have the radius of the circle!

Likewise, what is the circumference of a 12 inch circle? Circumference & Areas

Size in InchesCircumference InchesArea in Square Inches
1237.700144.000
12 1/438.480150.060
12 1/239.270156.250
12 3/440.060162.560

Just so, how do you calculate the length of a circle?

A circle is 360° all the way around; therefore, if you divide an arc's degree measure by 360°, you find the fraction of the circle's circumference that the arc makes up. Then, if you multiply the length all the way around the circle (the circle's circumference) by that fraction, you get the length along the arc.

What is the formula for area?

The most basic area formula is the formula for the area of a rectangle. Given a rectangle with length l and width w, the formula for the area is: A = lw (rectangle). That is, the area of the rectangle is the length multiplied by the width.

## How to Calculate the Circumference of a Circle

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How To Calculate The Circumference of a Circle

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