Final answer:
The area of the square with a side length of 3/7 units is 9/49 square units.
Step-by-step explanation:
The area of a square is found by multiplying the length of its side by itself. In this case, the side length is 3/7 units. So, to find the area, we multiply 3/7 by 3/7.
3/7 * 3/7 = 9/490
Therefore, the area of the square is 9/49 square units.