This is a problem which was sent to me by a friend , but i couldn't solve it , in particular , i don't have ideas for that .
I hope you can help by hints or any thing .
Here is the problem in the image .
2026-04-09 00:00:43.1775692843
How can we prove that this triangle is Equilateral Triangle?
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This is known as Morley's trisector theorem.