Answer:
We are given that the dimensions are 4 in x 9 in. To get the smallest possible square, first let us find for the LCM of 4 and 9.
4 = 0, 4, 8, 12, 16, 20, 24, 28, 32, 36
9 = 0, 9, 18, 27, 36
We can actually see that 36 is the least common multiple.
Therefore the smallest possible square has a dimension of:
36 inches by 36 inches