The area of a square playground is 256.6404 square metres. Find the length of one side of the playground.

Explanation

To find the length of one side of a square playground given its area, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the relationship between area and side length**:
The area \( A \) of a square is given by the formula:
\[
A = a^2
...