Skip to main content

Your source for content-rich, kid-safe online resources.

  • Global rating average: 5.0 out of 5
  • 5.0
  • 5.0
  • 5.0
  • 5.0
  • 5.0

Math: Geometry: Circumference

Learn how to calculate the circumference of a circle also known as a perimeter of a circle. Find out what radius and diameter are and how to find their values. There are links to eThemes resources on perimeter and pi number. Includes an animation, interactive exercises, quizzes, and worksheets.


  • 4,
  • 5,
  • 6,
  • 7,
  • 8


Learn the definition of a circumference and how to calculate its value. Select the letter-link "Cc" and click on the word "Circumference" to view the formula and try an online circumference calculator.
Select the "Measuring Circles" icon on the page to watch an animation and learn about circumference and area of a circle. Take a quiz after watching the movie.
This page has interactive exercises on calculating the circumference of a circle.
Use this worksheet to practice calculating circumference.
Complete the table on this worksheet and find radii, diameters, and circumferences of circles.
Find circumference of a circle with given radii or diameter.
Learn how to find diameter, radius, and circumference of a circle. Scroll down the page for online exercises. NOTE: The site has a link to a forum and includes ads.
This lesson plan is designed for seven graders to help students to learn how to find circumference and measure diameter and radius.
This lesson plan is designed to help students calculate diameter and radii of circles using known circumference.
Here are five online exercises on finding circumference.
Learn the formulas for circumference of a circle and learn how to solve problems involving diameter and radius of a circle. NOTE: The "Talk" link leads to message boards.
These sites include activities and lesson plans for measuring perimeter. Some sites feature interactive quizzes and games.
Learn the constant number Pi = 3.14. Find out why it is celebrated on March 14th every year. Discover why this number is considered to be a mysterious and fascinates some mathematicians. Learn how to calculate the number and use it for solving problems and equations. Includes animations, word problems, lesson plans, crafts, trivia, and quizzes.

Education Standards


Created: | Updated: