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Calculate the Circumference of a 4 cm Diameter Circle

Learn how to find the circumference of a circle using its diameter with our simple guide.

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Video transcript

The circumference of a circle can be found using the formula C = πd, where C is circumference and d is diameter. For a 4 cm diameter circle: C = π * 4 cm = 12.57 cm (approximately).

Questions and answers

  1. What formula do I use to find the circumference of a circle?

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

  2. How do you derive the circumference formula?

    The circumference formula can be derived from the relationship between the diameter and the constant π (pi), which represents the ratio of the circumference to the diameter.

  3. What is the circumference of a circle with a 10 cm diameter?

    Using the formula C = πd, the circumference for a 10 cm diameter circle is approximately 31.42 cm.

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For a deeper understanding of circle-related calculations, check out our guide on the area of a circle and related geometry concepts.