👉 Euclidiodes was a Greek philosopher known for his work in geometry, particularly in the study of triangles and circles. He is credited with discovering the Pythagorean theorem, which states that in any right-angled triangle, the square of the length of the hypotenuse (the longest side) is equal to the sum of the squares of the lengths of the other two sides. This theorem has had a profound impact on understanding geometry and has been used extensively by mathematicians and scientists for centuries