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How Do You Find the Radius of a Circle if You Know the Circumference?

Note:

Want to find the radius of a circle? Already have the circumference? Then you can use the formula for the circumference of a circle to solve! This tutorial shows you how to use that formula and the given value for the circumference to find the radius. Take a look!

Keywords:

  • circumference
  • solve for radius
  • unknown radius
  • circle
  • isolate r

Background Tutorials

  • Decimal Operation Problems

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        How Do You Multiply Decimals?

      How Do You Multiply Decimals?

      Doing math with paper and pencil can come in real handy, so make sure you're comfortable multiplying decimals by hand. After all, you don't want the calculator to be a crutch!

  • Evaluating Expressions

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        What is a Variable?

      What is a Variable?

      You can't do algebra without working with variables, but variables can be confusing. If you've ever wondered what variables are, then this tutorial is for you!

  • Circle Definitions

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        What is a Circle?

      What is a Circle?

      Circles are a fundamental part of math! In this tutorial, you'll be introduced to circles and see the different parts of a circle such as the diameter, radius, and chord. Check out this tutorial to learn about circles!

  • Circumference

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        What is Circumference?

      What is Circumference?

      The circumference of a circle is the distance around that circle. But what is the formula to find the circumference? In this tutorial, you'll learn the formulas for the circumference of a circle. Take a look!

Further Exploration