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Answer:
Thales has been credited with the discovery of five geometric theorems: (1) that a circle is bisected by its diameter, (2) that angles in a triangle opposite two sides of equal length are equal, (3) that opposite angles formed by intersecting straight lines are equal, (4) that the angle inscribed inside a semicircle is a right angle, and (5) that a triangle is determined if its base and the two angles at the base are given. His mathematical achievements are difficult to assess, however, because of the ancient practice of crediting particular discoveries to men with a general reputation for wisdom.
Answer:
It has been credited with a discovery of 3 geometric theorems.
1. that a circle is bisected by its diameter
2. that angles in a triangle opposite two sides of equal length are equal
3. that opposite angles formed by intersecting straight lines are equal