Activity Overview
In this activity, students use the drawing and measurement tools of Cabri™ Jr. to blend coordinate geometry with drawing tools. They visualize symmetry and reflect a point across the y-axis. NCTM Geometry Standards: Specify locations and describe spatial relationships using coordinate geometry and other representational systems. Apply transformations and use symmetry to analyze mathematical situations.
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
Set up the
TI-Navigator™ system
See the attached PDF file for detailed instructions for this activity
Print pages 46 - 47 from the attached PDF file for your class
During the Activity
Distribute the pages to your class.
Follow the Activity procedures:
Draw a triangle
Find the coordinates of the triangle
Reflect the triangle across the y-axis
Find the coordinates of the reflected triangle
Explore the relationship between the original coordinates and the coordinates of the reflected triangle
TI-Navigator activity:
Load a background image of a triangle in Quadrant 1
Have students mark a point on the triangle then mark a second point which is the image of the first point reflected across the y-axis
After the Activity
Review student results:
As a class, discuss questions that appeared to be more challenging
Re-teach concepts as necessary