There are two cylindrical containers, the ratio of the bottom radii of A and B is 3:2, the depth of water in container A is 9 cm, and the depth of water in container B is 4 cm. Now pour the same amount of water into both containers until the water depth is the same. How many centimeters will A's water level rise?
有两个圆柱形的容器，甲、乙的底面半径比是3：2，甲容器中水深9厘米，乙容器中水深4厘米．现向两个容器中倒入同样多的水，直到水深相同．甲的水面将上升多少厘米？
<gadget id="calculator">9 * 9</gadget>
<output>81</output>

<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">81 - 16</gadget>
<output>65</output>

<gadget id="calculator">9 - 4</gadget>
<output>5</output>

<gadget id="calculator">65 / 5</gadget>
<output>13</output>

<gadget id="calculator">13 - 9</gadget>
<output>4</output>

<result>4</result>