**Circumference**From

**Diameter**

So if the **diameter** of your **circle** is**10 feet**, you'd calculate **10** × 3.14 = 31.4**feet** as the **circumference**, or **10** ×3.1415 = 31.415 **feet** if you're asked for a more exactanswer.

Likewise, people ask, what is the circumference of a 3 foot diameter circle?

**Circumference** = 2*PI*radius = PI***diameter**so your answer is **3***PI **feet** long. If the brass stripencircles the cover, then it goes around the outside edge, or the**circle's circumference**. Since the **diameter** is given,the C = πD = π(**3**) = 3π or approximately**3**(3.14) = 9.42 **feet**.

Furthermore, what is the circumference of a 12 diameter circle? The **circumference** of a **circle** is the**diameter** x 3.1416. The **diameter** of a **circle** isthe **circumference** multiplied by 0.31831. The area of a**circle** is the **diameter** x **diameter** x0.7854.

Also asked, what is the circumference of a 24 inch diameter circle?

If you have the **diameter** measurement, multiply itby pi to find the **circumference**. For example, a wheel with a10-**inch diameter** will have a **circumference** of 10 x3.14, or 31.4 **inches**.

What is the circumference of a 5 foot diameter circle?

where r is the radius of a **circle**. and thereforeC = πd (where d is the **diameter**). So since d = **5feet**, the **Circumference** of the **circle** is 5π**feet**.

## What is the formula for circumference?

**formula**for finding the

**circumference**of a circle using the diameter. The

**formula**is simply this: C = πd. In this

**equation**,”C” represents the

**circumference**of the circle, and “d”represents its diameter. That is to say, you can find the

**circumference**of a circle just by multiplying the diameterby pi.

## What is the circumference of a 4 foot diameter circle?

**circumference**of a

**circle**can be foundby 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 youknow the radius, the

**diameter**is twice aslarge.

## What is a radius of a circle?

**radius of a circle**is the distance from thecenter of the

**circle**to any point on its circumference. Theeasiest way to find the

**radius**is by dividing the diameterin half.

## How do I find diameter if I know circumference?

**diameter**of thecircle, d= C/π. In this example, “d = 12 / 3.14.” or “The

**diameter**is equal to twelve divided by 3.14.” Divide the

**circumference**by pi to get the answer. In this case, the

**diameter**would be 3.82 inches.

## How do you find the diameter with the area?

**Calculate the Diameter of a Circle, from Its Area**

- Divide the area (in square units) by Pi (approximately3.14159). Example: 303,000/3.14159 = 96447.98.
- Take the square root of the result (Example: 310.56). This isthe radius.
- Now double the radius to get the diameter (Example: 621.12meters).

## How do you work out the radius from the circumference?

**Calculating Radius**Using

**Circumference**

Suppose you know that the **circumference** of acircle is 20 centimeters and you want to **calculate** the**radius**. Just plug the value for the **circumference**into the equation and solve. Remember that pi is approximatelyequal to 3.14.

## How do you find the circumference with the area?

**area**of a circle,π*r^2, or pi times radius r squared =

**Area**A. Use theformula for the

**circumference**of a circle, 2*π*r, or 2times pi time radius r =

**Circumference**C. Then, multiply theradius r by 2*π to obtain C, the

**circumference**: C =2*π*sqrt(A/π). Done!

## How do I find the length of an arc?

**find arc length**, start by dividing the

**arc's**central angle in degrees by 360. Then, multiply thatnumber by the radius of the circle. Finally, multiply that numberby 2 × pi to

**find**the

**arc length**.

## Is diameter half of the circumference?

**circumference**(c).

**Half**of the

**diameter**,or the distance from the midpoint to the circle border, is calledthe radius of the circle (r).

## How do you measure a circle?

**circle**, and you know itscircumference, you would divide the circumference by pi to find thediameter of the

**circle**. Half the diameter is the radius.Square the radius and multiply by pi to find the area of the

**circle**.

## What is pi r2?

**Pi**) times the Radius squared:A = π

**r**. or, when you know the Diameter:A = (π/4)× D

^{2}^{2}. or, when you know the Circumference:A =C

^{2}/ 4π

## How do you find area?

**find the area**of a rectangle multiply itsheight by its width. For a square you only need to

**find**thelength of one of the sides (as each side is the same length) andthen multiply this by itself to

**find the area**.

## How many millimeters are in a diameter?

Inches (“) | Millimeters (mm) |
---|---|

1/4 ″ | 6.35 mm |

1/2 ″ | 12.7 mm |

1 ″ | 25.4 mm |

2 ″ | 50.8 mm |

## What is the circumference of a 30 foot round pool?

**Round Pool**

For the sake of this calculation, you can use 3.14 asthe value for pi. So, a **round pool** with a 20-**foot**diameter has a **circumference** of 3.14 x 20, or 62.8**feet**.

## How do you find the circumference of a pipe?

**How to Calculate the Circumference of a Pipe**

- Measure the diameter of the pipe. For example, assume the pipehas a diameter of four feet.
- Determine how accurate your measurement needs to be. If youneed a general estimate, you can use 3.14 as pi.
- Multiply the diameter by pi. In the example, four feet times3.14 equals 12.46 feet.

## How do we calculate the volume of a cylinder?

**Calculate**the area of the base (which is acircle) by using the

**equation**πr² where r is theradius of the circle. Then, multiply the area of the base by theheight of the

**cylinder**to find the

**volume**.