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The German mathematician Gottfried Wilhelm Leibniz used the symbol ~ for similarity, as used in geometry.
pythagoras. he had lots of different theorums, one named after him in fact(pythagorases theorum) he came up wth the symbol from ancient greek drawings.
Pythagoras
The father of congruence of triangles is Euclid, a renowned ancient Greek mathematician known as the "Father of Geometry." In his seminal work, "Elements," Euclid laid down the foundational principles of geometry, including the concept of congruence of triangles. He established the criteria for triangle congruence, such as the Side-Angle-Side (SAS) and Angle-Side-Angle (ASA) postulates, which are still fundamental in modern geometry. Euclid's contributions to the study of triangles and their congruence have had a lasting impact on mathematics and geometric reasoning.
William Jones, a Welsh mathematician, first used the pi symbol in 1706.