Presumably for the same reasons that it is used in the 21st century.
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The Pythagorean theorem was, oddly enough, first postulated by a Greek named Pythagoras of Samos, in the 6th century BC or so. It basically described the relationship among the three sides of a triangle and the areas of the same. There is some thought that Babylonian mathematicians well before the time of Pythagoras knew of the relationship, but he's the guy who got his name on the theorem.
Pythagoras was a Greek mathematician and philosopher who lived in the 6th century BCE. He is most well-known for his theorem, known as the Pythagorean Theorem, which states that in a right-angled triangle, the square of the hypotenuse (the side opposite the right angle) is equal to the sum of the squares of the other two sides. Pythagoras founded a philosophical and religious school in ancient Greece known as the Pythagorean School. The school was known for its emphasis on mathematics, music, and the idea that numbers were the key to understanding the universe. Pythagoras and his followers believed in the concept of the harmony of the spheres, which linked mathematical ratios to the movement of planets and celestial bodies.
The 6th century was the years 501 to 600.
Beginning in the 6th century BC with the Pythagoreans, the Ancient Greeks began a systematic study of mathematics as a subject in its own right with Greek mathematics. Around 300 BC, Euclid introduced the axiomatic method still used in mathematics today, consisting of definition, axiom, theorem, and proof.
The Fundamental theorem of arithmetic states that every naturalnumber is either prime or can be uniquely written as a productof primes.