Activity Overview
In this activity, students will learn to use the Dilation tool on the Cabri™ Jr. application. They will also investigate the properties of dilations and the effects of dilations in the coordinate plane.
Before the Activity
Install the Cabri Jr. App on the students' graphing calculators using TI-Connect™, a TI Connectivity Cable and the Unit-to-Unit Link Cable
Use the TI-Navigator™ to transfer the attached Cabri Jr. AppVar files to each calculator
See the attached PDF file for detailed instructions for this activity
Print pages 63 - 66 from the attached PDF file for your class
During the Activity
Distribute the pages to your class.
Follow the Activity procedures:
Use the AppVar to go directly to the exploration section
Create a dilation factor tool
Draw a triangle to dilate, and a point that will be the center of the dilation
Dilate the triangle using the dilation factor tool
Observe the relationship between the pre-image and the image formed by the dilation using measurement tools (Distance and length, angle, and slope)
After the Activity
Review student results:
As a class, discuss questions that appeared to be more challenging
Re-teach concepts as necessary