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joi, 30 iulie 2026

https://gogeometry.blogspot.com/2026/07/geometric-challenge-1621-problem.html

 


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miercuri, 29 iulie 2026

Mathstackexchange, geometry - In $\triangle ABC$, $AB = AC$ and $\angle B = 40^\circ$ . $D$ is a point on $AB$ produced such that $AD = BC$. Join $DC$. Find $\angle DCB$ . - Mathematics Stack Exchange

 


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luni, 27 iulie 2026

Angel Silva Palacios, Training Geometry Olympiad, https://www.facebook.com/photo?fbid=1872372997056216&set=gm.1694422275151412&idorvanity=293155508611436

 


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sâmbătă, 25 iulie 2026

Anie Luc, Geometria Super Top, https://www.facebook.com/photo?fbid=122159419298416607&set=gm.2323356811768008&idorvanity=830782544358783

 


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joi, 23 iulie 2026

Geometria Super Top, Chris Wildhagen, problem by Anie Luc, https://www.facebook.com/photo/?fbid=1791241638703011&set=gm.2322429151860774&idorvanity=830782544358783

 


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marți, 21 iulie 2026

Training Geometry Olympiad, Angel Silva Palacios, https://www.facebook.com/photo?fbid=1867830004177182&set=gm.1690140702246236&idorvanity=293155508611436

 


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sâmbătă, 18 iulie 2026

Training Geometry Olympiad, Angel Silva Palacios, https://www.facebook.com/photo?fbid=1863384657955050&set=gm.1685936825999957&idorvanity=293155508611436

 


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Geometria Super Top, Dong le Minh https://www.facebook.com/photo?fbid=4516632665291447&set=gm.2394306588006363&idorvanity=830782544358783

 Note: I came up with the following proof 53 years ago, during an exam; as the majority of solvers used the 3 concurrent circumcircles of th...