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## පයිතගරස් ප්රමේය හා ත්රිකෝණමිතිය

**Pythagoras**

Grade 11 Mathematics 3rd term lesson Pythagoras and Trigonometry PDF Download

**Pythagoras of Samos **^{}was an Ionian Greek philosopher and the eponymous founder of the Pythagoreanismmovement. His political and religious teachings were well-known in Magna Graecia and influenced the philosophies of Plato, Aristotle, and, through them, Western philosophy. Knowledge of Pythagoras’s life is largely clouded by legend and obfuscation, but he appears to have been the son of Mnesarchus, a seal engraver on the island of Samos. Modern scholars disagree regarding Pythagoras’s education and influences, but they do agree that, in around 530 BC, he travelled to Croton, where he founded a school in which initiates were sworn to secrecy and lived a communal, ascetic lifestyle. Following Croton’s decisive victory over Sybaris in around 510 BC, Pythagoras’s followers came into conflict with supporters of democracy and Pythagorean meeting houses were burned. Pythagoras may have been killed during this persecution, or he may have escaped to Metapontum, where he eventually died.

The teaching most securely identified with Pythagoras is *metempsychosis*, or the “transmigration of souls”, which holds that every soulis immortal and, upon death, enters into a new body. He may have also devised the doctrine of *musica universalis*, which holds that the planets move according to mathematical equations and thus resonate to produce an inaudible symphony of music. Scholars debate whether Pythagoras himself developed the numerological and musical teachings attributed to him, or if those teachings were developed by his later followers, particularly Philolaus of Croton. He probably prohibited his followers from eating beans, but he may or may not have advocated a strictly vegetarian diet.

In antiquity, Pythagoras was credited with many mathematical and scientific discoveries, including the Pythagorean theorem, Pythagorean tuning, the five regular solids, the Theory of Proportions, the sphericity of the Earth, and the identity of the morning and evening stars as the planet Venus. It was said that he was the first man to call himself a philosopher (“lover of wisdom”)^{} and that he was the first to divide the globe into five climatic zones. Classical historians debate whether Pythagoras made these discoveries, and many of the accomplishments credited to him likely originated earlier or were made by his colleagues or successors. Some accounts mention that the philosophy associated with Pythagoras was related to mathematics and that numbers were important, but it is debated to what extent, if at all, he actually contributed to mathematics or natural philosophy.

Pythagoras influenced Plato, whose dialogues, especially his *Timaeus*, exhibit Pythagorean teachings. Pythagorean ideas about mathematical perfection also impacted ancient Greek art. His teachings underwent a major revival in the first century BC among Middle Platonists, coinciding with the rise of Neopythagoreanism. Pythagoras continued to be regarded as a great philosopher throughout the Middle Ages and his philosophy had a major impact on scientists such as Nicolaus Copernicus, Johannes Kepler, and Isaac Newton. Pythagorean symbolism was used throughout early modern European esotericism and his teachings as portrayed in Ovid‘s *Metamorphoses* influenced the growth of the vegetarian movement.