Index

Pythagorean theorem, Heron, Ptolemy, Brahmagupta, Menelaus, Ceva, Nine Point Center, Theaetetus, Euler's Polyhedron, Pascal, Pappus, van Aubel, Eyeball, Butterfly, and more.

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gogeometry.com/geometry/classical_theorems_index.html

## Friday, December 26, 2008

### Classical Theorems

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classical theorem

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Hi antonio, here is a audiovisual proof for several theorems in your site:

ReplyDeletehttp://www.youtube.com/watch?v=RKZNLmItGsU&list=PL2CC49A548527528B&feature=plpp_play_all

For a triangle, suppose the two tangent lines drawn from a point of the circumscribed circle to the inscribed circle intersect the circumscribed circle at P and Q, then show that the line PQ is tangent to the inscribed circle.

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