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A Demonstration of Pythagoras' Theorem

Author:
Andrew Stacey
Topic:
Pythagoras or Pythagorean Theorem, Trigonometry
The diagram demonstrates Pythagoras' Theorem (and its generalisation to the cosine rule). This demonstration works by virtue of the fact that in Euclidean geometry, everything scales as one would expect, and that translation and rotation do not affect length.

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