# Euclid 1.47 Animated

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Proposition 47 of Book 1 of Euclid's *Elements*, sometimes referred to as a verse of the gospel as *Euclid 1.47*, is commonly known as the Pythagorean theorem. After more than two millennia and about 400 different proofs, Euclid's remains a classic, still taught in secondary schools as an archetype of logical deduction. This Demonstration, designed for classroom use, combines Euclid's text with an animated version of his classical diagram.

Contributed by: Paolo Maraner (November 2018)

Open content licensed under CC BY-NC-SA

## Details

Euclid's text is from Fitzpatrick's bilingual edition of the Elements [1], with minor variations by the author. Colors and graphic ideas are from Byrne's 1847 four-color edition [2].

References

[1] R. Fitzpatrick, ed., *Euclid's Elements of Geometry: The Greek Text of J.L. Heiberg (1883–1885) from Euclidis Elementa, edidit et Latine Interpretatus est I. L. Heiberg, in Aedibus B. G. Teubneri*, 1883–1885, 2008.

[2] O. Byrne, *The Elements of Euclid*, London: William Pickering, 1847.

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