There is A． Two cylindrical containers B are initially filled with 2 liters of water in container A and container B is empty. Now pour water into the two containers at a flow rate of 0.4 liters per minute. After 4 minutes, the water levels in the two containers are equal. Assuming that the radius of the base of B is 4 cm, what is the area of the base of A in square centimeters?
有A．B两个圆柱形容器，最初在容器A里装有2升水，容器B是空的．现在往两个容器中以每分钟0.4升的流量注入水，4分钟后，两个容器的水面高度相等．设B的底面半径4厘米，那么A的底面积是多平方厘米？
<gadget id="calculator">3.14 * 36</gadget>
<output>113.04</output>

<result>113.04</result>