# How to Find the Circumference of a Circle

To calculate the circumference of a circle, multiply the diameter of the circle with π (pi). The circumference can also be calculated by multiplying 2×radius with pi (π=3.14).

How is the formula for the circumference of a circle derived?
To calculate the circumference of a circle, use the formula C = πd, where “C” is the circumference, “d” is the diameter, and π is 3.14. If you have the radius instead of the diameter, multiply it by 2 to get the diameter.
www.wikihow.com/Calculate-the-Circumference-of-a-Circle
How do you find the circumference with only the diameter?
Write down the 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 diameter by pi.
www.wikihow.com/Calculate-the-Circumference-of-a-Circle
How to determine the geometry of a circle?

Math Made Easy—How to Find the Circumference of a Circle

1. Find the Circumference of a Circle Given the Radius
2. Find the Circumference of a Circle Given the Diameter
3. Find the Radius of a Circle Given the Circumference
4. Find the Circumference of a Circle Given the Area