## CabriJava demonstration of Brianchon's Theorem |

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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