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Tool: Scalene Triangles - Math Open Reference
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An interactive applet and associated web page that demonstrate the properties of scalene triangles.

The applet presents a scalene triangle where any vertex can be dragged to reshape it. As it is dragged, the length of the sides and interior angles are continuously changed. If a change is made that causes two sides to be the same length, they are highlighted and the message "not scalene" appears. The massages and measures can be turned off for class discussions.

The text on the page has links to other pages defining each angle type in depth.

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

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

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Courses: Geometry Scalene