Education Technology

Similarity and Dilations

Activity Overview

Students will discover properties of similar figures using the TI-89 and CABRI Geometry II to use dilations to dynamically manipulate figures. (Topic - Similar Figures and the Role of Dilations)

Before the Activity

Students should have access to the TI-89/TI-89 Titanium.

During the Activity

Students will use the TI-89 and CABRI™ Geometry to use dilations to dynamically manipulate figures in order to discover properties of similar figures. This activity may be teacher directed or discovery.

After the Activity

Review student results:

  • As a class, discuss questions that appeared to be more challenging
  • Re-teach concepts as necessary