How to Calculate the Radius of a Circle Using Circumference and Area

Learn how to find the radius of a circle using its circumference or area with simple formulas.

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To solve for R in a circle: If you know the circumference (C), use the formula R = C / (2π). If you know the area (A), use R = √(A/π). These formulas allow for quick and effective calculation of a circle's radius when provided with either the circumference or area.

FAQs & Answers

  1. What formula do I use to find the radius from the circumference? Use the formula R = C / (2π) to find the radius when you have the circumference.
  2. How can I calculate the radius using the area of the circle? To calculate the radius from the area, use R = √(A/π).
  3. What is the relationship between diameter and radius? The radius is half of the diameter; R = D / 2.
  4. Are there any other methods to find the radius of a circle? Yes, you can also find the radius using the circle's coordinates in a Cartesian plane if you have a diameter.

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