# Pythagoras Theorem Calculator

This is an online Pythagoras Theorem calculator that helps you find out the length of any side of a right triangle, provided you know the lengths of the other two sides. Besides the calculator, it also provides you with information about Pythagoras Theorem.

## What is Pythagoras Theorem?

The Pythagorean Theorem (aka. Pythagoras’ theorem) describes the relations between the three sides of a right triangle. It states that the sum of the squares of the shorter sides of a right triangle equals the square of the hypotenuse.  Here is the formula:

`a2 + b2 = c2`

where a and b are the length of the two shorter sides and c is the length of the hypotenuse.

The theorem was named after the ancient Greek philosopher and mathematician Pythagoras, who lived in the sixth century BC.

## Pythagoras Theorem example

Let’s solve the triangle below. Find x. The triangle is a right-angled triangle. Therefore, we can find the length x using the Pythagoras Theorem.

x is the hypotenuse. We first start by writing the equation: `92 + 122 = x2`

We can then use algebra to find x:

92 + 122 = x2

225 = `x2`

x = 15

## How to use the Pythagoras Theorem calculator?

1. Under the Find box, select the side that you want to find out (a / b / c).
2. Input the length of the two sides that you have. For example, suppose you want to find c, enter the value of a and b.
3. The result is automatically calculated and displayed in the field below.

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