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Tool: Euclid's Elements, Book I, Proposition 27 - Transversal of Parallel Lines
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Go to: http://aleph0.clarku.edu/~djoyce/java/elements/bookI/propI27.html (opens a new window)
Description: Euclid's proposition states that when a straight line intersects two other lines and the resulting alternate angles are equal, then the two lines crossed are parallel. 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 Parallel, Alternate interior angles, Alternate exterior angles