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Tool: Brianchon's First Theorem
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Description: A Cabri *.fig file written to illustrate Brianchon's First Theorem which can be stated, "If AB, CD, and EF are concurrent at X, and BC, DE, and FA are concurrent at Y, then AD, BE, and CF are concurrent." This is the dual of Pappus's Theorem.
Technology Type: Cabri 
Author: Wilson Stothers
Language: English 
Cost: Does not require payment for use

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Courses: Geometry Straightedge and compass