Tool:
Euclid's Elements, Book I, Proposition 29  Properties of the Angles of a Transversal of Parallel Lines 
Screenshot:

Go to: 
http://aleph0.clarku.edu/~djoyce/java/elements/bookI/propI29.html
(opens a new window)

Description: 
Euclid's proposition states that when a transversal crosses two parallel lines it makes the alternate angles equal, the alternate equal to the opposite and interior angle, and the sum of the interior angles on the same side equal to the measure of two right angles. 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 
