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| CabriJava demonstration of Brianchon's Theorem |
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Brianchon's Theorem states that, if alternate sides of a hexagon (AB'CA'BC' in the figure) are concurrent, Then the lines joining opposite vertices are concurrent. It is the dual of Pappus's Theorem. |
You may move any of the points A,B,C,A',B',C'
by clicking on it and dragging it to a new position.
You will see that AA', BB' and CC' remain concurrent.
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