Perimeter of a given polygon = 25 ft. Perimeter of a polygon is the sum of all the side lengths of the polygon.
Given side lengths are 9 ft, 6 ft, 2 ft, 3 ft, 3 ft, and q. Here, we should find one missing side length.
The missing side length is q ft.
Add all the known side lengths of the given polygon because perimeter is given.
9 ft + 6 ft + 2 ft + 3 ft + 3 ft = 23 ft.
Now, subtract 23 ft from the perimeter of 25 ft to know the missing side length.
The missing side length q = 25 ft - 23 ft = 2 ft.
Therefore, q = 2 ft. It means that the length of the missing side is 2 ft.