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Tool: Parabolas: The Folded Rectangle Construction
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Go to: http://www.keypress.com/.../FoldedRectangle.zip (opens a new window)
Description:

With just a blank sheet of paper and a single point, students can fold a genuine parabola. Students model the technique with Sketchpad to reveal the underlying mathematics. The link to the tool itself is to a zip file that contains both the sketch and a pdf file of the corresponding activity, as well as four other sketches for further exploration.

This is a free sample activity from Exploring Conic Sections with the Geometer's Sketchpad.

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

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Activities: Exploring Conic Sections with The Geometer's Sketchpad
Parabolas: The Folded Rectangle Construction
Courses: Algebra II Parabolas
PreCalculus parabolas