Answer: 4 foot.
Explanation:
Here, we have a rectangular sheet of plywood with dimension 4 foot × 8 foot
That is, length of the rectangle = 4 foot and breadth = 8 foot.
Since we have to cute the plywood.
And, form a square from it.
Since, we know that all sides of square are same.
Therefore we have to cut a figure which has the same side.
When we cut the rectangle from the middle we found two sheet of 4 foot side length.
Since, both figures have the same side length of each edges.
Therefore both are squares of sides 4 foot.