Euclid's Pythagoras Theorem proof

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SUMMARY

The discussion centers on Euclid's proof of the Pythagorean theorem, specifically addressing the area relationship between the hypotenuse square and the left rectangle formed during the proof. The user seeks clarification on why the area of the left rectangle equals the area of the left square. The solution provided indicates that the triangles formed are similar to the original triangle, leading to a proportional relationship that confirms the area equality.

PREREQUISITES
  • Understanding of Euclidean geometry principles
  • Familiarity with the Pythagorean theorem
  • Knowledge of similar triangles and their properties
  • Basic algebra for area calculations
NEXT STEPS
  • Study Euclid's Elements, particularly Book I, for foundational geometry concepts
  • Explore the properties of similar triangles in-depth
  • Learn about geometric proofs and their applications in mathematics
  • Investigate area calculations for various geometric shapes
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Students of geometry, mathematics educators, and anyone interested in understanding classical proofs in mathematics.

zeion
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Homework Statement



Hi. I'm looking at Euclid's proof of the Pythagoras theorem.
After cutting the square of the hypotenuse I don't understand why the area of the left rectangle (of the hypotenuse square) is equal to the area of the left square?

Homework Equations





The Attempt at a Solution

 
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hi zeion! :smile:

because the triangle is cut into two triangles each similar to the original …

so the base of the rectangle is a times (a/c) :wink:
 

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