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Tool: Exploring Properties of Rectangles and Parallelograms Using Dynamic Software
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Go to: http://www.nctm.org/standards/content.aspx?id=25040 (opens a new window)
Description: Students manipulate a rectangle and a parallelogram in this applet to explore their respective properties. The surrounding page gives teachers some ideas of reflection questions to ask their students, and further activities surrounding properties of quadrilaterals.
Technology Type: Java Applet 
Guide: User's Guide (opens a new window)
Author: NCTM: Illuminations
Language: English 
Cost: Does not require payment for use

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