How to Calculate the Radius of a Cylinder from Circumference

Learn how to find the radius of a cylinder using its circumference in this quick Q&A video.

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To find the radius of a cylinder without the diameter, you need the circumference. Use the formula C = 2πr, where C is the circumference and r is the radius. Rearrange the formula to r = C / (2π). For example, if the circumference is 31.4 cm, the calculation would be r = 31.4 / (2 * 3.14) = 5 cm.

FAQs & Answers

  1. What is the formula to calculate the radius of a cylinder? To calculate the radius, use the formula r = C / (2π), where C is the circumference.
  2. Can I find the radius if I only have the height of the cylinder? No, you need the circumference to calculate the radius; height alone is not sufficient.
  3. How do you find the circumference of a cylinder? The circumference can be found using the formula C = 2πr, where r is the radius.
  4. Why is knowing the radius important in cylinder calculations? The radius is essential for calculating surface area, volume, and other geometric properties of the cylinder.

Watch More

For more insights into geometric calculations and mathematical concepts, check out our videos on finding the area of circles and exploring 3D shapes.

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