CabriJava demonstration of the Three Tangents Theorem

The Three Tangents Theorem states that, if the tangents at A, B and C on a conic meet
in D, E and F, as shown, then AD, BE and CF are concurrent

You may move any of the points A,B,C on the conic
or change the shape of the conic by moving the unlabelled points.
You will see that AD, BE and CF remain concurrent.

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