Answer:
9 inches
Step-by-step explanation:
Volume is the product of cross sectional area and height.
V=Ah
Where A is area of base and h is height
Given that the base is square, the area of square is given by A=b*b
Xonsidering that the area is given as 81 square inches then
b*b=81
b is the square root of 81 which is +9 or -9
Since base must be positive interger, then base is 9 inches
