How to Calculate the Radius of a Circle: Easy Methods Explained

Learn how to accurately calculate the radius of a circle using circumference or area formulas.

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To calculate the radius, use the formula `radius = circumference / (2 π)` if you have the circumference, or `radius = √(area / π)` if you have the area. For example, if the circumference is 31.4 units, the radius would be `31.4 / (2 3.14)` = 5 units. Both methods will give you the radius you need.

FAQs & Answers

  1. What is the formula to calculate the radius from the circumference? The formula is radius = circumference / (2π).
  2. How do you find the radius from the area of a circle? Use the formula radius = √(area / π) to find the radius.
  3. What is the relationship between radius and diameter? The diameter is twice the radius; diameter = 2 * radius.
  4. Can I calculate the radius with just the diameter? Yes, divide the diameter by 2 to get the radius.

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