Since, area of square patch of fabric = 2.25 square inches
Area of square of side 's' = [tex]s^2[/tex]
Since, area of square patch of fabric = 2.25 square inches
[tex]2.25 = s^2[/tex]
[tex]s = \sqrt{2.25}[/tex]
s = 1.5 inches
Therefore, the side length of the patch is 1.5 inches.