Using the circumference what is the radius

This article has been viewed 3,, times. Learn more The radius of a circle is the distance from the center of the circle to any point on its circumference.

Example If using 3. So, the radius of a circle with an area of 21 square centimeters is about 2. Areas always use square units like square centimeters , but the radius always uses units of length like centimeters. Example For a circle with a circumference of 15, you would divide 15 by 2 times 3.

Be sure to include the units in your answer. To learn more, such as how to calculate the radius with the area or diameter, keep reading the article! Did this summary help you? Yes No. Log in Social login does not work in incognito and private browsers. Please log in with your username or email to continue. No account yet? Create an account. Edit this Article. We use cookies to make wikiHow great.

By using our site, you agree to our cookie policy. Cookie Settings. Learn why people trust wikiHow. Download Article Explore this Article methods. Tips and Warnings. Related Articles. Article Summary. Method 1. Write down the circumference formula. How to Find the Perimeter of a Circle. How to Convert Circumference to Diameter on a Calculator. How to Find the Circumference of a Circle. How to Calculate the Linear Footage in a Radius.

How to Calculate a Circular Area. How to Find the Radius of an Arc. How to Calculate Wheel Circumference. How to Calculate the Radius of a Pipe.

How to Calculate the Radius of a Square. How to Find the Radius of a Circle. This proportion circumference to diameter is the definition of the constant pi. 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. Circle Calculator. Circle Image. Units m cm mm mi yd ft in. Significant Figures auto 3 4 5 6 7 8 9. Answer: radius. Share this Answer Link: help Paste this link in email, text or social media.