Define and explain in detail your favourite mathematical theorem. Pythagorean Theorem The Pythagorean Theorem, named after a Greek mathematician, Pythagoras, who was the leader of a small group of mathematicians who devoted themselves to studying numbers. The Pythagorean theorem is a straightforward theorem to learn, and the theorem can be applied to almost all cases of trigonometry. Unlike the other theorems, the Pythagorean theorem is quite simple to learn and understand. The theorem states that the square of the hypotenuse is equal to the sum of the squares of the perpendicular and base of the triangle. Mathematically, (Hypotenuse)2 = (Perpendicular)2 + (Base)2 Pythagorean Theorem = 𝑎² ᐩ 𝑏² = 𝑐² c a b