# Pythagorean Theorem Calculator

Find the hypotenuse of a right triangle with this pythagorean theorem calculator.

Leg A Length:
Leg B Length:
Fill in the lengths of both legs to determine hypotenuse.

## How do you get the hypotenuse from the pythagorean theorem?

To calculate the hypotenuse, use the pythagorean theorem as follows:

A2 + B2 = C2

A and B are the lengths of the legs of the triangle. C is the hypotenuse.

Example: A right triangle with a length of Leg A as 50 inches and a length of Leg B as 50 inches has a hypotenuse of:

502 + 502 = C2

C2 = 5000

C = 70.7107 inches

## What is the Pythagorean Theorem?

It's also known as Pythagoras' Theorem. The Pythagorean Theorem is an equation that solves for the length of the hypotenuse of a right triangle. Using this to find the hypotenuse has some very important uses for us in the real world. Real Life Uses for The Pythagorean Theorem

### 3-4-5 Rule

Used a lot in construction, the 3-4-5 rule is used to check to see if a measurment is square. The rule uses the pythagorean theorem to verify that a corner is 90 degrees. The rule states that if you measure 3 feet from a 90 degree corner in one direction, 4 feet in the other then the hypotenuse should be 5 feet. If it's not, then the corner isn't truly 90 degrees. You can plug 4 and 3 into the hypotenuse calculator to verify that the hypotenuse is 5.