Activity Overview
Students' will learn how to perform a reflection using the Cabri™ Jr. application, and will explore the properties of reflections. This activity will extend the concepts of reflection to 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 45 - 48 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
Draw a triangle and a reflection line
Reflect the triangle over the line of reflection and observe the relationship between the pre-image and the image
Drag the vertices and sides of the triangle, points on the reflection line and observe the relationship between the pre-image and image
Draw a triangle to reflect in the coordinate plane
Reflect the triangle across the x-axis and y-axis
Observe the relationships between the coordinates of the vertices of the pre-image and the corresponding coordinates of the vertices of the image
After the Activity
Review student results:
As a class, discuss questions that appeared to be more challenging
Re-teach concepts as necessary