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Tool: Ellipses: The Congruent Triangles Construction
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Go to: http://www.keypress.com/.../CongruentTriangles.zip (opens a new window)
Description:

A pair of congruent triangles holds the key to this unusual Sketchpad ellipse construction. 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 a second sketch 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
Ellipses: The Congruent Triangles Construction
Courses: Algebra II Ellipses
PreCalculus ellipses