Pythagorean Theorem Calculator

Enter 2 out of 3 to solve for the missing side or all 3 for the pythagorean proof:
<--- Side 1
<--- Side 2
<--- Hypotenuse

Given a right triangle with a side length of 4 and a Hypotenuse of 5, calculate the remaining side:

The Pythagorean Theorem is shown below:
Side12 + Side22 = Hypotenuse2
This is also written as a2 + b2 = c2 where c is the hypotenuse.

Solving for Side 1 by isolating it and taking the square root of both sides, we get:
Side 1 = √Hypotenuse2 - Side 22

Plugging in our Hypotenuse and Side 2, we get
Side 1 = √52 - 42
Side 1 = √25 - 16
Side 1 = √9
Side 1 = 3