In a Right Triangle, the easiest way to solve the measure of the one side when two sides are given is by Pythagorean Theorem.

Where,
a = Opposite Side
b = Adjacent Side
c = Hypotenuse
Let's rotate the figure to better understand the problem,
Let's now find the value of x,



![c\text{ = }\sqrt[]{64\text{ + 36}}\text{ = }\sqrt[]{100}](https://img.qammunity.org/2023/formulas/mathematics/college/owicp06fip7j5kdn5up073qhxr8p79bjyh.png)

Thus, x = 10