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November 1st, 2019, 08:06 AM   #1
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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.
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November 1st, 2019, 05:55 PM   #2
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