Pythagoras’ theorem (second lecture)
Pythagoras’ theorem is both the oldest and the most important non-trivial theorem in mathematics.
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![Pythagoras Would Be Proud: High School Students’ New Proof of the Pythagorean Theorem [TRIGONOMETRY]](https://sun9-76.userapi.com/NjGIOYL56tky2MLk1U3VNBNEYLrbPC9athnpfA/k9qGAZI47AY.jpg)
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