By simply entering the values of the two sides, (a) (sometimes called attitude or perpendicular) and (b), the base of the right triangle, users can easily find the value of (c) the hypotenuse, which is the longest side of the right triangle.

The formula, a2 + b2 = c2, shows that the sum of the squares of sides a and b of the right triangle will equal the hypotenuse, which is the longest side of that triangle, side c.