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Tool: Euclid's Elements, Book I, Definitions 11 & 12 - Obtuse and Acute Angles
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Go to: http://aleph0.clarku.edu/~djoyce/java/elements/bookI/defI11.html (opens a new window)
Description: Gives Euclid's original definitions of obtuse and acute angles 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 Obtuse, Acute

  tpowers
Comment:What can I say? Euclid deserves five stars, but I found the page hard to navigate/not functional in all browsers. Still good, though.