# 570 BC ± 10

## Description

Thales of Miletus, considered as the first philosopher in the Greek tradition, uses deductive reasoning applied to geometry for the first time to prove the Thales' theorem## Location

Ancient Greece## Rate

Very important (8)## Sphere

Science## Quotations

In a circle the angle in the semicircle is right, that in a greater segment less than a right angle, and that in a less segment greater than a right angle; and further the angle of the greater segment is greater than a right angle, and the angle of the less segment less than a right angle.