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Activity: Quadrilateral Exploration: Shape Maker Pictures
Go to: http://www.keypress.com/.../QuadrilateralExploration.zip (opens a new window)
Description: Students first use the seven "Quadrilateral Makers" (square maker, rhombus maker, rectangle maker, parallelogram maker, kite maker, trapezoid maker, and quadrilateral maker) to make a design of their own. They then use the Quadrilateral Makers to match a particular arrangement of seven shapes. In the process they reason about the various types of quadrilaterals and form and test conjectures about their properties and behavior. The link to the activity itself is to a zip file that contains both the activity sheets in pd format and the corresponding sketches.

This is a free sample activity from Shape Makers: Developing Geometric Reasoning in Middle School with the Geometer's Sketchpad.

Technology Type: Sketchpad 
Author: Key Curriculum Press/Michael Battista
Language: English 
Cost: Does not require payment for use

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Activity: Shape Makers: Developing Geometric Reasoning in Middle School with the Geometer's Sketchpad
Tool: Quadrilateral Exploration: Shape Maker Pictures
Courses: Math 7 Quadrilateral properties
Geometry Quadrilaterals