Which ancient greek idea is still used today to describe the relationship between the sides of a right rectangle?

Pythagoras is the correct answer.

Explanation:

Pythagoras was a Greek philosopher and famous mathematician. He is known for providing the proof of Pythagorean theorem about the right angles. He also started a group of mathematicians who used to worship numbers. He influenced many mathematicians, Plato was one of them. He also had an impact on astronomy and the theory of music. He is considered to be one of the greatest thinkers and his theories are still used. He was born in an island near the western coast of Asia Minor.

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