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How to Calculate the Circumference of a Circle: Example with Diameter 4

Learn to calculate the circumference of a circle given its diameter. Discover how to apply the formula easily in real-life situations.

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Video transcript

The circumference of a circle can be calculated using the formula C = πd. If the diameter is 4 units, the circumference C = π * 4. Using an approximate value for π (3.1416), the circumference is about 12.57 units. This formula is handy for various applications, from planning circular layouts to understanding wheel sizes.

Questions and answers

  1. What is the circumference formula?

    The circumference of a circle is calculated using the formula C = πd, where d is the diameter.

  2. How do I apply the circumference formula?

    To apply the circumference formula, simply multiply the diameter of the circle by π (approximately 3.1416).

  3. Why is understanding circumference important?

    Understanding circumference is important for various applications, such as planning circular layouts or working with wheels.

  4. What if I have the radius instead of the diameter?

    If you have the radius, you can find the circumference using the formula C = 2πr, where r is the radius.

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For more insights on geometric calculations, check out our video on area and perimeter of different shapes for practical applications in real life.