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Activity: Why AAA does not prove congruence - Math Open Reference
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Go to: http://www.mathopenref.com/congruentaaa.html (opens a new window)
Description:

An interactive applet and associated web page that shows that angle-angle-angle (AAA) is not enough to prove congruence. The applet shows two triangles, one of which can be dragged to resize it, showing that although they have the same angles they are not the same size and thus not congruent.

The web page describes all this and has links to other related pages.

Applet can be enlarged to full screen size for use with a classroom projector. After use in the classroom, student can access it again from any web browser at home or in the library with no login required.

This resource is a component of the Math Open Reference Interactive Geometry textbook project at http://www.mathopenref.com.

Technology Type: Flash 
Author: John Page
Language: English 
Cost: Does not require payment for use

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Courses: Geometry Triangles, Congruence, Similarity

  mwalsh
Comment:Simple, yet effective visual for understanding why AAA isn't absolute proof that triangles are congruent.