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Tool: Euclid's Elements, Book I, Definitions 20 & 21 - Triangles
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Go to: http://aleph0.clarku.edu/~djoyce/java/elements/bookI/defI20.html (opens a new window)
Description: Gives Euclid's original definitions of an equilateral, isosceles, scalene, right-angled, obtuse-angled, and acute-angled triangle and then examines the definitions' validity and durability. To reset the applet, press "r" while your cursor is over the diagram.
Technology Type: Java Applet 
Guide: User's Guide (opens a new window)
Author: David E. Joyce
Language: English 
Cost: Does not require payment for use

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Courses: Geometry Isosceles, Equilateral, Scalene, Right, Obtuse, Acute