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# What Is the Formula for a Circumference of a Circle?

**The formula for the circumference of a circle is 2(pi)r.** R stands for the radius of the circle, which can also be found by taking the diameter and dividing it by 2, and pi can be approximated by the decimal 3.14.

The circumference of a circle is also the perimeter of the circle. While very basic questions might ask a student to find the circumference of a circle given a certain radius, the circumference of a circle can also be required for more complicated problems. For example, the circumference of the Earth is needed to be able to solve for its linear velocity.

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## How Do You Measure Diameter?

A: If the radius of the circle is known, the diameter formula is diameter=2R, where R equals the circle's radius. If the circumference of the circle is known,... Full Answer >Filed Under: -
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## How Do You Figure Area?

A: The area of any simple shape, such as a circle, triangle or rectangle, can be found by taking a series of measurements from the shape and plugging them int... Full Answer >Filed Under: -
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## How Do You Calculate the Square Footage of a Circle?

A: The area of a circle is determined by the formula: A = π r2. You can easily calculate the area of a circle in under a minute. All you need is a calculator,... Full Answer >Filed Under: -
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## How Do You Find the Diameter of a Circle?

A: Find the diameter of a circle with a given circumference by solving for the formula "d=C/pi," where d is the diameter, C is the circumference and pi is 3.1... Full Answer >Filed Under: