Calculate Circumference: Using the Radius of a Circle

Learn how to find the circumference of a circle when the radius is given using the formula C = 2πr.

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The formula for circumference of a circle, if the radius (r) is given, is C = 2πr. This means you multiply the radius by 2 and then by π (approximately 3.14159). For example, if the radius is 5, the circumference is 2 × 3.14159 × 5 = 31.4159.

FAQs & Answers

  1. What is the formula for circumference if diameter is given? The formula for circumference when diameter (d) is given is C = πd, where π is approximately 3.14159.
  2. How do you calculate radius if circumference is known? To find the radius from the circumference, use the formula r = C/(2π).
  3. What does circumference mean in a circle? Circumference is the total distance around the circle, measured along its edge.
  4. Can circumference be found without a calculator? Yes, you can calculate circumference using basic multiplication, approximating π as 3.14 for simpler calculations.

Watch More

For more insights on geometric calculations, check out our videos on area of circles and the properties of triangles to enhance your math skills.

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