Two equilateral triangles share a vertex. Prove that the four red points are concyclic.
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Solution

More solutions: https://x.com/Mirangu1/status/1856616246277546162
Two equilateral triangles share a vertex. Prove that the four red points are concyclic.
Scroll down for a solution to this problem.

More solutions: https://x.com/Mirangu1/status/1856616246277546162
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