Answer-
The approximate side length of the square is 4.2 units.
Solution-
Properties of diagonals of square
- The diagonals of a square bisect each other and meet at 90°
- The diagonals of a square bisect its angles.
- The diagonals of a square are equal.
Let us assume that the side length is x.
So, applying Pythagoras Theorem,





Therefore, the approximate side length of the square is 4.2 units.