# PYTHAGORAS THEOREM

The Pythagorean theorem states that in a right triangle, the square of the length of the hypotenuse (the side opposite the right angle) is equal to the sum of the squares of the lengths of the other two sides.

This can be written as an equation:

**a^2 + b^2 = c^2, **

where c is the length of the hypotenuse and a and b are the lengths of the other two sides. This theorem can be used to find the length of a missing side of a right triangle if you know the lengths of the other two sides.

## Here are a few more points about the Pythagorean theorem:

The theorem is named after the ancient Greek mathematician Pythagoras, who is credited with its discovery.

The theorem is often used in geometry to find the distance between two points. For example, if you have the coordinates of two points on a coordinate plane, you can use the theorem to find the distance between them.

The theorem can be used in many other fields, such as physics and engineering, to solve problems involving distances and lengths.

The theorem can be generalized to three dimensions, where it is known as the Pythagorean triple. In this case, the theorem states that in a three-dimensional right triangle, the square of the length of the hypotenuse (the side opposite the right angle) is equal to the sum of the squares of the lengths of the other two sides.

The theorem can be used to prove the existence of irrational numbers, which are numbers that cannot be expressed as the ratio of two integers. For example, the theorem shows that the square root of 2 is irrational, because it cannot be expressed as a ratio of two integers.

In a right triangle, the side opposite the right angle is called the hypotenuse. The other two sides are called the legs of the triangle.

The theorem can be used to find the length of the hypotenuse if you know the lengths of the legs. For example, if you have a right triangle with legs of length 3 and 4, you can use the theorem to find the length of the hypotenuse: 3^2 + 4^2 = c^2, or 9 + 16 = c^2. Solving this equation gives you c = 5, so the length of the hypotenuse is 5.

The theorem can also be used to find the lengths of the legs if you know the length of the hypotenuse. For example, if you have a right triangle with a hypotenuse of length 5, you can use the theorem to find the lengths of the legs: a^2 + b^2 = 5^2, or a^2 + b^2 = 25. If you know that one of the legs is 3, you can solve for the other leg: 3^2 + b^2 = 25, or 9 + b^2 = 25, or b^2 = 16. Taking the square root of both sides gives you b = 4, so the other leg has a length of 4.

The theorem can also be used to determine whether a set of numbers could be the lengths of the sides of a right triangle. For example, if you have three numbers (a, b, c) and you want to know whether they could be the lengths of the sides of a right triangle, you can use the theorem to check: a^2 + b^2 = c^2. If this equation is true, then the numbers could be the lengths of the sides of a right triangle.