Activity Overview
In this activity, you will explore the invariant properties of rotations and the results of rotations 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 53 - 56 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
Construct a triangle to rotate and a point that will be the center of rotation
Construct a rotation angle tool
Rotate the triangle using the tool
Drag the sides and vertices of the triangle and points on the tool and observe the relationships between the pre-image and the image
Construct a triangle on a coordinate axis to rotate
Rotate the triangle and identify the coordinates of some vertices
Form a counter-clockwise rotation, drag the vertice and look for patterns in the coordinates of the vertice and its image
After the Activity
Review student results:
As a class, discuss questions that appeared to be more challenging
Re-teach concepts as necessary