Education Technology

Geometry: Diameter and Circumference of a Circle
by Texas Instruments

Published on October 17, 2012

Overview

In this activity, students explore the relationship between a circle's circumference and its diameter. This will lead students to their own discovery of a value for pi.

Key Steps

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    Students explore the diameter and circumference of a circle. They use the Cabri™ Jr. app to construct a circle.

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    Students construct the diameter of a circle, measure it, and record their answer. Then they use the Measurement tool to find the circumference of the circle.

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    Changing the size of the circle, students will observe the value of the ratio of the circumference to the diameter. On the Home screen, they can confirm these ratios.