The Pythagorean theorem is also known as the Pythagorean theorem.

The Pythagorean theorem is an elementary geometry theorem. It is one of the important mathematical theorems discovered and proved by humans in the early days. It is one of the most important tools for solving geometric problems with algebraic thinking and one of the links between numbers and shapes. The Pythagorean theorem is a special case of the cosine theorem. There are about 400 ways to prove the Pythagorean theorem, which is one of the theorems with the most proof methods in mathematics. "The cosine is equal to the hypotenuse" is the most basic formula of the Pythagorean theorem. The positive integer group (a, b, c) of the Pythagorean theorem equation a2 + b2 = c2. (3, 4, 5) is the Pythagorean number. In other words, if the two right-angled sides of a right triangle are a and b, and the hypotenuse is c, then a2+b2=c2, that is, the sum of the squares of the two right-angled sides of a right triangle is equal to the square of the hypotenuse.

a^2 + b^2 = c^2