GeoDom
domingo, 12 de junio de 2016
A Perspector Associated to Cevians
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This is an old open problem by Oai Thanh Đào. Here I give a proof. Consider a triangle ABC. Let D be a point inside triangle ABC. Let ...
domingo, 22 de mayo de 2016
Pythagoras in 60 Seconds
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Short film by Alan Kitching, made in 1986. Apart from explaining the famous theorem, it is also conceived as a "visual proof"... i...
domingo, 15 de mayo de 2016
Another Archimedean circle in an arbelos
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Click here to read the article.
Golden sections of triangle centers in the golden triangles
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Click here to read the article. Related topics: Golden Ratio in Geometry
miércoles, 1 de abril de 2015
Concurrence Of Circles In Arbelos
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Simple but nice. Description and proofs
domingo, 28 de diciembre de 2014
Proclivity of Conjoint Archimedean Twins for Proliferation
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Description
domingo, 21 de diciembre de 2014
Concurrence On The Nine-Point Circle (No proven yet)
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Much more interesting than the particular case I proposed, is the generalization by Francisco Javier García Capitán at ADGEOM1280 . ...
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