The distance around the edge of the circle is called the circumference. The distance from one side of the circle to the other, going through the center of the circle, is the diameter. For any circle, if you divide the circumference by the diameter you get pi, an irregular number usually rounded to 3. Say aloud the meaning of the formula's symbols to make sure you understand, saying "Circumference equals pi times the diameter of a circle.
Plug the numerical value for your circle's circumference into the formula; for instance, 12 inches. In this example, write. Divide the circumference by pi to get the answer. In this case, the diameter would be 3.
Alexander White has been writing about science since , specializing in earth science. It is used in many areas, such as physics and mathematics.
For example, you can find it in the centrifugal force calculator. The circumference of a circle is the linear distance of the circle's edge. It is equivalent to the perimeter of a geometric shape, although that term perimeter is only used for polygons. The first person to calculate the Earth's circumference was Eratosthenes, a Greek mathematician , in B. He discovered that objects in a city on the Northern Tropic do not throw a shadow at noon on the summer solstice, but they do in a more northerly location.
Knowing this, and the distance between the locations, he succeeded in calculating the Earth's circumference. If you want to find the diameter from the circumference of a circle , follow these steps:. To find the radius from the circumference of a circle , you have to do the following:.
To calculate the circumference of a circle with a radius of 1 meter , simply follow these steps:. To find the circumference of a cylinder , you have to be aware that a cylinder's cross-section is a circle. If you know the cylinder's radius:. If you want to find the area of a circle with a circumference of 1 meter , do the following:. To find the radius of a circle with a circumference of 10 centimeters , you have to do the following:.
Since a circle's circumference is the linear distance of the circle's edge, it describes a length. Therefore, the most common units of a circle's circumference are millimeter, centimeter, meter for the metric system, and inch, feet, and yard for the imperial system. Embed Share via. Table of contents: Definition of circumference Formula for circumference How to find the circumference of a circle Circumference to diameter FAQ.
Read on to learn: What the definition of circumference is How to find the circumference of a circle How to convert circumference into diameter As is the case with all of our tools, the circumference calculator works in all directions - it is also a circumference to diameter calculator, and can be used to convert circumference to radius, circumference to area, radius to circumference, radius to diameter duh! Definition of circumference The circumference of a circle is the linear distance of a circle's edge.
Circumference is often misspelled as circumfrence. It is an irrational number, so we typically use approximations such as 3. How to find the circumference of a circle Determine the radius of a circle. Let's assume it's equal to 14 cm. Use our circumference calculator to find the radius when you only have the circumference or area of a circle. FAQ How to find the circumference of a circle? To calculate the circumference, you need the radius of the circle : Multiply the radius by 2 to get the diameter.
That's it; you found the circumference of the circle. You have a couple options. Find something that is 4 cm in diameter or slightly smaller and draw around it. Use a compass set to a radius of 2 cm. Use a drawing program and set the circle properties so that it has a diameter of 4 cm. Not Helpful 84 Helpful Divide the circumference perimeter by pi. That gives you the diameter.
Half of that is the radius. To get the area, square the radius, and then multiply by pi. Not Helpful 43 Helpful The diameter is equal to the cube root of the following: 6 times the volume divided by pi. Not Helpful 49 Helpful The diameter is formed from the center of one side of a circle to the other, meaning that there are no coordinates since the diameter is always located in the center of the circle.
Not Helpful 94 Helpful Not Helpful 13 Helpful Include your email address to get a message when this question is answered. By using this service, some information may be shared with YouTube. Using geometrical formulas and equations gets easier with practice. Ask for help from someone who has worked with circles or any other geometrical figures. You're likely to find that questions of geometry will seem less challenging with a little experience.
Helpful 20 Not Helpful Familiarize yourself with the use of a compass the drawing tool, not the direction-finder. This is a very useful instrument in many applications, including drawing a circle's diameter, as outlined above.
A divider an instrument similar to a compass can sometimes be used in such cases. Helpful 0 Not Helpful 0. Submit a Tip All tip submissions are carefully reviewed before being published. Related wikiHows How to. How to. Co-authors: Updated: May 8, Categories: Geometry.
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