Who was Thales?
Thales was a greek mathematician. He is famous for the theorem named after him - Thales' theorem - stating that any triangle over a diameter touching a semicircle is rectangular.
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### Instruction: Who was Thales?
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### Response: Thales was a greek mathematician. He is famous for the theorem named after him - Thales' theorem - stating that any triangle over a diameter touching a semicircle is rectangular.