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Tool: Euclid's Elements, Book 3, Proposition 19 - The Internal Line Perpendicular to a Tangent of a Circle
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Go to: http://aleph0.clarku.edu/.../propIII19.html (opens a new window)
Description: Euclid's proposition states that when a line is drawn perpendicular to a circle's tangent, then that line passes through the circle's center (and is a diameter). The guide then examines the structure of the proposition. The 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 Diameter, Tangents