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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. 

Create a Lesson Plan including the following information:

• Detailed description of your activity, which must include the application of the characteristics and properties of the chosen geometric manipulative
• Instructions for conducting the activity
• Materials needed
• State standards addressed by your activity
• Assessment strategies for your activity