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## Euclid
The fifth postulate of the Euclidean geometry, called the In addition to a treatment of plane geometry, including proofs of the Pythagorean theorem and a version of the more general law of cosines, Euclid's book also contains the beginnings of elementary number theory, such as the notion of divisibility, the greatest common divisor and the Euclidean algorithm to determine it, and the infinity of prime numbers. Later chapters deal with three-dimensional geometry and the platonic solids. The book also contains proofs that the area of a circle is proportional to the square of its radius, and that the volume of a sphere is proportional to the cube of its radius.
While the ## External links- Interactive version of Euclid's Elements - David E. Joyce
- Oliver Byrne's edition of the Elements of Euclid, published in 1847. These scanned images are presumably now available in the public domain, although it would be polite to contact the site operator first:
Euclid of Alexandria has occasionally been confused with the philosopher Eukleides (Euclid) of Megara who lived about a century earlier. Such confusion may have begun with Valerius Maximus (c.20 BC*c.AD 50), a contemporary of Tiberius, who claimed (search for "Eucliden") that Plato turned to Euclid for help with a geometrical problem.
Euclid is also a programming language developed at the University of Toronto by Holt et al, originally for the Motorola 6809 microprocessor. | |||||

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