Question

What is the most famous theory of triangles in geometry?​

Answer 1

Answer:

Pythagoras Theory

Answer 2

$\huge\purple {\mathfrak{Bonjour Mate!}}$

The most famous and useful contribution of the Pythagoreans was the Pythagorean Theorem. The theory states that the sum of the squares of the legs of a right triangle equals the square of the hypotenuse.