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Neuron

This mathematician is named Pythagoras. He was the mathematician who discovered in what relation are the sides, angles, and length of the sides of a triangle. Today this idea is still being used in mathematics and represents one of the foundations in geometry that we use all around.

Answer: Euclid

Step-by-step explanation:

Euclid, the Greek mathematician wrote the most definitive text on geometry, is still referred to today. Euclid was considered as the “Father of Geometry”, and was known to be a great mathematician