Final answer:
The length of the third side, or the hypotenuse, is 4√2.
Step-by-step explanation:
The Pythagorean theorem relates the lengths of the legs of a right triangle to the length of the hypotenuse. It states that a² + b² = c², where a and b are the lengths of the legs and c is the length of the hypotenuse. In this case, a = 4 and b = 4. To find the length of the hypotenuse, we can substitute the values into the equation and solve for c:
c = √(4² + 4²)
c = √32
c = 4√2
So, the length of the third side, or the hypotenuse, is 4√2.