Although nobody knows for sure who first made the discovery that the earth is round, Pythagoras is indeed regarded as being the first recorded person to make the claim that the earth is round.
Well, Pythagoras being a person, would have to have been made by another two persons. Unless you're referring to Pythagoras's theorem, in which I'd have to say Pythagoras. His theory was later proved by one of his followers.
pythagoras
his theory for right angled triangles
Pythagoras
Many philosophers have made contributions, such as Pythagoras, who made the Pythagorean theory, which is talking about angles such as a right angle and making that into an equation.
the Ryan jolly uses them because he is a mathmatic nerd also he is related to Pythagoras by blood. Ryan jolly recently made the jolly theory and to this day he is very un important
pythagoras made the famous pythagoras theorem and many more....
The Persians discovered the theory long before Pythagoras, but Pythagoras made it well known and proved it many times. He got the idea from the Egyptian rope-stretchers, of which you can ask another question for them.
He dissected animals and made discovered the theory of the circulation cycle.
Pythagoras made many contributions to the field of math.
The first person to discover that all plants are made up of cells was Matthias Schleiden, a German botanist, in the 1830s. He observed plant tissues under a microscope and concluded that all plants are composed of cells. This observation was a crucial step in the development of the cell theory.