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 November 1st, 2019, 08:06 AM #1 Senior Member     Joined: Mar 2015 From: Universe 2.71828i3.14159 Posts: 169 Thanks: 65 Math Focus: Area of Circle Geometry Problem Series, Question 1: A circle circumscribed to the triangle $ABC$. $D$ is a point on the circumcircle. Prove that symmetries of the point D according to the edges of the triangle are collinear.
 November 1st, 2019, 05:55 PM #2 Global Moderator   Joined: Dec 2006 Posts: 21,124 Thanks: 2332 See this article.

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