1. The problem asks for the root of 36. 2. The root usually refers to the square root, which is the number that when multiplied by itself gives the original number. 3. The formula for the square root of a number $x$ is $\sqrt{x}$. 4. Applying this to 36, we calculate $\sqrt{36}$. 5. Since $6 \times 6 = 36$, the square root of 36 is 6. 6. Therefore, the root of 36 is 6.