How to Calculate the Circumference of a Circle: Simple Formulas Explained

Learn the easy formulas for calculating the circumference of a circle using diameter or radius in this quick guide.

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To calculate the circumference of a circle, multiply its diameter by π (approximately 3.14159). The formula is: C = πd where 'C' is the circumference and 'd' is the diameter. Alternatively, if you know the radius 'r', the formula is: C = 2πr. These straightforward formulas help you quickly and accurately determine the circumference!

FAQs & Answers

  1. What is the formula for circumference? The circumference of a circle is calculated using the formula C = πd or C = 2πr.
  2. How do you calculate circumference with the radius? To find circumference using the radius, use the formula C = 2πr, where r is the radius.
  3. Why is π used in circumference calculations? π (Pi) is a constant representing the ratio of a circle's circumference to its diameter, approximately equal to 3.14159.
  4. Can circumference be calculated without measuring the diameter? Yes, you can calculate circumference using the radius with the formula C = 2πr.

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If you found this video helpful, check out our other math tutorials on related topics like area calculation and circle properties to deepen your understanding!

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