Thales of Miletus was a prominent Greek philosopher, mathematician and astronomer, known as one of the Seven Sages of Greece. Spent most of his work in the sixth century C. Considered the father of Greek philosophy, belonged to the Ionian school with Anaximander and Anaximenes, and others. These said that water, moisture, more precisely, is the fundamental principle from which other elements of nature. Delas In mathematics field, it is believed that following such a trip made to Egypt, Greece took the principles of geometry in that country. It also established the theorem that bears his name, related to the parallel system. In astronomy, became famous when he predicted a solar eclipse which occurred on 28 May in the year 585 BC
It is a philosophical school founded during the last years of the seventh century BC, which belonged to Thales. Its principles were based on the search for empirical grounding of the nature outside religious influences.
In Thales' theorem states that if two or more lines that come together in a point are cut by parallel lines, the segments formed are proportional to each other.