Answer:
9 inches
Explanation:
4.5 plus 4.5 equals 9 so that would be 9 inches. They said 1 side is equal to 4.5 so that means the other side equals 4.5 because the planter is a cube and a cube side is equal (all four of them) so let's add 4.5 plus 4.5 equals 9 so the answer is 9 inches.