Elementray Mathematics: Teaching Geometry

Prepare an activity involving a geometric manipulative designed to teach a geometric concept to an elementary school student. You can create your own activity or modify an existing activity; if you are modifying an existing activity, however, ensure your sources are properly cited.
Note: Local Campus students must prepare a 5- to 10-minute presentation demonstrating the activity for the class.
Create a handout including the following information:
A detailed description of your activity, which must include the application of the characteristics and properties of the chosen geometric shape
Instructions for conducting the activity
Materials needed