What is circumference in math

Although the circumference of a circle is its length, it cannot be calculated with the help of a ruler scale like it is usually done for other polygons. This is because a circle is a curved figure. Pi is a special mathematical constant with a value approximated to 3. Let us consider a practical illustration to understand how to calculate the circumference of a circle with the help of the circumference formula.

Illustration: The radius of the circle is 25 units find the circumference of the circle. Check out the below-listed articles related to the circumference of a circle and learn the basics. Example 1: A garland woven with flowers needs to be stuck around a circular ring to decorate it. How long should the garland be so as to cover a ring of a radius of 28 cm? To find the length of the garland, we have to find the circumference of the ring. Therefore, the length of the garland is cms.

Example 2: The circumference of a wheel is cm. Find its radius and diameter. Let the radius of the circle be R. Therefore, the radius is 70cm, and the diameter is cm. Example 3: The perimeter of a rectangular wire is m.

The same wire is bent into the shape of a circle. Find the radius of the circle formed using the circumference formula. Therefore the Radius is 42m. Example 4: Tom runs three rounds at a circular stadium field every day before starting his cricket practice. The diameter of the field is 28 m. How much does he run around the field every day?

Since Tom runs around the circular field, we need to find the circumference of the field. Hence, the circumference of the field is 88 m. We know that Tom runs around the field thrice. Hence, we multiply the circumference by 3. Therefore, Tom runs meters. Diameter -- The distance from the circle through the circle's center to the circle on the opposite side. Draw a line segment from the center of the circle to any part of the circle and you have the radius.

Circumference Formula Two formulas are used to find circumference, C , depending on the given information. Diameter To Circumference If you are given the circle's diameter, d , then use this circumference of a circle formula:.

Instructor: Malcolm M. Malcolm has a Master's Degree in education and holds four teaching certificates. He has been a public school teacher for 27 years, including 15 years as a mathematics teacher. Local and online. View Tutors.

Geometry Help. Tutors online. Ask a question Get Help. View Math Tutors. Popular cities for math tutoring Math Tutors New York. Find a math tutor near you Learn faster with a math tutor. Find a tutor locally or online. 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. The result is the circle's circumference. What is the circumference of a circle? Who calculated the circumference of the earth first? How do I find the diameter from the circumference?

And that's it; you have the circle's diameter. How to find the area of a circle from the circumference? Divide the result by 2 to get the circle's radius. Multiply the radius by itself to get its square. You found the circle's area from the circumference. How do I find the radius from the circumference? The result is the circle's diameter. Divide the diameter by 2. There you go, you found the circle's radius.

How to measure the circumference? Wrap a string around the object and measure the length of it. Use Omni's circumference calculator. What is the formula for the circumference? What is the circumference of a circle with a radius of 1 meter? To calculate the circumference of a circle with a radius of 1 meter , simply follow these steps: Multiply the radius by 2 to get the diameter of 2 meters.

And there you go; the circumference of a circle with a radius of 1 meter is 6. How do I find the circumference of a cylinder? If you know the cylinder's radius: Multiply the radius by 2 to get the diameter. That's it; you found the circumference of the cylinder.

The result is the cylinder's circumference.