How to Calculate Radius from Circumference: Easy Formula Explained

Learn the simple formula to find the radius from the circumference of a circle in this quick tutorial.

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To find the radius from the circumference, use the formula: radius = circumference / (2 * π). For example, if the circumference is 31.4 units, the radius would be 31.4 / (2 * 3.14159) ≈ 5 units. This method ensures precise conversion from circumference to radius.

FAQs & Answers

  1. What is the formula to find the radius from circumference? The formula is radius = circumference ÷ (2 * π).
  2. How do you calculate circumference from radius? You calculate circumference using the formula: circumference = 2 * π * radius.
  3. Can I use this method for any circle size? Yes, this method works for circles of any size as long as you know the circumference.
  4. What is π (pi) and why is it important? π (pi) is a mathematical constant approximately equal to 3.14159, essential for calculations involving circles.

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