Answer: Your hypotenuse (or C) will be 8.9.
Explanation:
Pythagorean theorem is known as a²+b²=c². Most of the time, your hypotenuse will be known as c. To find c, you must have a and b, which are respectively 4 and 8.
4²=16 and 8²=64.
16+64=80
80=c²
Square root of 80 = 8.9