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How to Calculate Circumference Using Radius: Easy Formula Explained

Learn how to find the circumference of a circle using just the radius with a simple formula. Perfect for math enthusiasts!

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Video transcript

To find the circumference when you only have the radius, use the formula C = 2πr, where 'C' is the circumference and 'r' is the radius. Multiply the radius by 2 and then by π (approximately 3.14159). For example, if the radius is 5 units, the circumference is approximately 31.42 units.

Questions and answers

  1. What is the formula for circumference?

    The formula for circumference C is C = 2πr, where r is the radius.

  2. Can you find circumference without diameter?

    Yes, if you have the radius, you can easily calculate circumference using the formula C = 2πr.

  3. What is the value of π (pi)?

    π (pi) is approximately 3.14159, but can also be represented as a fraction 22/7 for simple calculations.

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If you enjoyed learning about calculating circumference, check out our videos on finding the area of a circle and other essential math concepts to enhance your understanding.