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Tool: Euclid's Elements, Book I, Proposition 5 - Isosceles Triangle
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Go to: http://aleph0.clarku.edu/~djoyce/java/elements/bookI/propI5.html (opens a new window)
Description: Euclid's proposition shows that the angle measure of the two base angles of an isosceles triangle remains the same when the two sides (other than the base) are extended equally. The guide then examines the structure of the proposition. 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