This lesson focuses on the characteristics of a circle including similarity, radius, circumference, and Pi. It provides formulas to determine the area of a circle, calculating Pi, and learning exercises throughout.

This resource provides two levels of multiple choice questions to review the parts of a circle as well as area and perimeter.

This basic website will give you lots of information about circles. There are also some questions to test your circle knowledge.

[Free Registration/Login may be required to access all resource tools.] This concept teaches students properties of inscribed quadrilaterals in circles.

[Free Registration/Login may be required to access all resource tools.] This concept teaches students properties of inscribed angles and how to apply them.

[Free Registration/Login may be required to access all resource tools.] Find the radius or diameter of a circle given its area.

This video tutorial demonstrates how to find the formula for the surface area of a cone.

[Free Registration/Login Required] Students change the length of a radius to explore the circumference of a circle. Click challenge me to answer practice questions and click learn more to watch a video.

Worksheets provide practice with finding the area or circumference of a circle and answer keys are provided. You can even create your own worksheet or flashcards.

In this lesson plan, 7th graders use their knowledge of formulas to determine the area and circumference of a circle.

[Free Registration/Login Required] This flipchart has information and practice regarding finding area and circumference of circles.

Students will discover how to estimate and measure the circumference and area of a circle.

The idea of perimeter can be applied not only to polygons but to circles as well. The same idea can be said for the area of a circle. (Continued. See "before the activity.") [Requires Adobe Reader.]

In this activity, students will measure round objects to determine the circumference and diameter, and use the data to explore geometric concepts of the circle with statistics.

This activity provides students an opportunity to explore the relationship between the diameter of a circle and its circumference. [Requires Adobe Reader.]

This WebMath site will assist with finding the radius, diameter, circumference, and area of a circle.

Students will measure the circumference and diameter of a variety of different circles. They will graph the class' values of (d,c) on the coordinate plane and use linear regression to approximate pi.

For this task, students investigate and develop an understanding of the formula for the area of a circle. Aligns with G-GMD.A.1.

This site provides a good project for young scholars to use to explore the circumference of a circle.

Use the formula for the circumference of a circle to solve the challenge of this problem. The solution is available at this one page website.

Seventh graders will measure the circumference and diameter of round things in the classroom and discover the ratio pi. They will see that the ratio of a circle's circumference to its diameter can be used to solve for the circumference...

Twenty-five problems cover various circle activities. They are given with each step to the solution cleverly revealed one at a time. You can work each step of the problem then click the "View Solution" button to check each step of your...

In this activity, students investigate the circumference of circles and learn about the irrational number Pi.

This multimedia site offers a beginner's guide to understanding the relationship between the diameter and circumference of a circle. This Learn Alberta site offers a video [1:44], interactive exercises and printable extended exercises.