Pythagorean Theorem Calculator 2026

For sides a = 3 and b = 4, the length of the hypotenuse c is calculated as follows:

c = √(a² + b²) = √(3² + 4²) = √(9 + 16) = √25 = 5

The hypotenuse is 5 units long. This means that in a right triangle with legs of 3 and 4 units, the longest side measures 5 units.

The calculator uses the Pythagorean theorem formula, which states that in a right triangle, the square of the hypotenuse is equal to the sum of the squares of the other two sides. You simply enter the values for sides a and b, and it computes the hypotenuse c for you.

Let's say you have a triangle with sides a = 5 and b = 12. To find the hypotenuse:

c = √(5² + 12²) = √(25 + 144) = √169 = 13

The hypotenuse in this case is 13 units long.

Remember, the Pythagorean theorem applies only to right triangles. If you're dealing with other triangle types, you may need different formulas. Always ensure your inputs are accurate for precise results!