Tool:
The 3 Tangents and 3 Chords Theorem 
Screenshot:

Go to: 
http://www.maths.gla.ac.uk/~wws/cabripages/3c3t.html
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Description: 
A Cabri *.fig file written to illustrate The 3 Tangents and 3 Chords Theorem which can be stated, "Triangle ABC is inscribed in a conic. If the tangent at A meets the chord BC at P, the tangent at B meets CA at Q and the tangent at C meets AB at R, then P, Q, and R are collinear." 
Technology Type: 
Cabri  
Author: 
Wilson Stothers 
Language: 
English  
Cost: 
Does not require payment for use 

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Courses: 
Geometry 
Straightedge and compass 
