Measuring Around

Students explore the relationship between a circle’s diameter and circumference.

By Amplify Classroom

7th Grade

Math

Today’s Goals • Given the radius, diameter, or circumference of a circle, calculate the other two measurements. • Explain that the relationship between the diameter and circumference of a circle is proportional and that the constant of proportionality is `\pi`. (Reading, Writing, Speaking, and Listening) Additional Materials a variety of circular objects, one per pair (if possible); measuring tools, string