Answer:
12π ft² or 37.7 ft²
Explanation:
The volume of a cylinder is given by the area of its base multiplied by its height. If total volume is 216 π ft³ and the height is 18 ft, then the area of the base is:
![V = Bh\\216\pi = B*18\\B= 12\pi \ ft^2](https://img.qammunity.org/2021/formulas/mathematics/college/y5ya3ntc5cgvcsberhrmbk7pgv2qnf8kog.png)
The base has an area of 12π ft² or 37.7 ft².