Coming Full Circle

Teaching Circumference, Diameter, and Radius

The resources in this playlist will help students gain a more rigorous understanding of the characteristics of a circle, including the relationships between a circle’s circumference, diameter, and radius. They’ll also learn how to use pi(π) when dealing with circle calculations.

Exploring the Diameter & Circumference of Circles | LearnAlberta

Help students discover the relationship between diameter and circumference with this interactive. Provides great support for visual learners who need to envision the relationship between a circle’s circumference and diameter in a different way. Set the diameter, unravel the circle and then drag the diameter onto the unraveled circumference. Flash Player required.

Calculating Circumference and Diameter | GeoGebra

This mesmerizing visual representation is another option to introduce students to the relationship between diameter and circumference and understand that the relationship between the two is about 3 times in order to introduce the idea of pi.

Study Jams! - Circumference | Scholastic

This Study Jams resource is great for introducing students to concepts related to measuring circles by building upon their current knowledge of measuring distance around objects. Students are guided through the process of finding the circumference of a circle using pi.

Exploring Circumference | Open Up*

OpenUp is an amazing resource for complete math lessons that allow students to learn through hands-on activities. By engaging with this lesson, students will be able to describe the relationship between circumference and diameter of any circle and explain what π means.

Circumference of Circles | CK-12*

If students need to review finding the radius for a circle, in addition to strengthening their understanding of how to find diameter and circumference, this resource lays it all out and allows space for continued practice.

Circumference of a Circle Practice | Khan Academy

Use this practice quiz to ensure that your students have a complete understanding of how to calculate the circumference of a circle given its radius or diameter.

Extension Activity: When Will We Ever Use It? (Person of Interest) | ClassHook

Take a deeper dive into the land of Pi. A substitute teacher responds to the question every student wants to know- “When will we ever use this?” In discussing pi, this teacher provides a compelling answer.

Extension Activity: The Infinite Life of Pi | TEDEd

Since we’re on the topic, let Reynaldo Lopes explain the many faces of pi by demonstrating how it’s applied to the study of music, financial models, and even the density of the universe.

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Eboni Hogan

Content Specialist

Eboni has extensive experience in curriculum development, with a focus on culturally-responsive and arts-based approaches. Having spent years creating academic content and providing professional development to teachers, she now curates themed playlists meant to provide educators with valuable, time-saving resources.

Common Core Standards

7.G.B.4 Know the formulas for the area and circumference of a circle and use them to solve problems; give an informal derivation of the relationship between the circumference and area of a circle.

7.RP.A.2 Recognize and represent proportional relationships between quantities.

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