The theorem where a triangle inscribed in a circle is right if and only if one of the legs is a diameter.
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Addition
THALES
In mathematics, Thales used geometry to solve problems such as calculating the height of pyramids and the distance of ships from the shore. He is credited with the first use of deductive reasoning applied to geometry, by deriving four corollaries to Thales' Theorem. As a result, he has been hailed as the first true mathematician and is the first known individual to whom a mathematical discovery has been attributed.[5]
That is a theorem.A theorem.
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