Pythagorean theorem:

In a right triangle, the sum of the squares of the measures of the sides is equals to the

square of the measure of the hypotenuse.

From the Pythagorean theorem

                   (Apply Pythagorean theorem)

                 (Evaluate powers: )

                             (Subtract 36 from each side)

                            (Take the positive square root of each side)

                                  ()

The value of .