Euclid index

Euclid Book 1 - Proposition 47
Pythagoras' theorem


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To be proved: In right-angled triangles the square on the side opposite the right angle equals the sum of the squares on the sides containing the right angle.

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There is a triangle ABC with angle BAC = 90°
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  

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