Pythagoras, a Greek mathematician and philosopher, made an important contribution in the fields of mathematics, science, music and astronomy in the 6th century BC. He had the belief that everything in the world can be explained by the numbers. It has raised important scientific problems that were 15 centuries later.
Geometry
Pythagoras studied the forms and in particular triangles and find a surprising fact about triangles:
The sum of the angles of a triangle equals two right angles (1800). If the triangle has a right angle (90 °), it is called a triangle and has special properties. If a, b and c are three sides of a right triangle, the longest side “c” is called the hypotenuse.

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