christopher's square sandbox has 36 ft² of playing space. it was constructed using 4 boards. One of the sandbox sports needs to be replaced. what Link Board should Christopher's father cut to repair the side of the sandbox?

6 feet

Step-by-step explanation:

The area of a square is:

a=s^2, where s is the side

We know the area is 36, so we can substitute that in

36=s^2

Take the square root of both sides

6=s

s = 6 feet

One side is 6 feet, so that is how long the board should be cut.