A conical container with a bottom radius of 4 cm and a height of 9 cm is filled with water and poured into a cylindrical container with a bottom radius of 2 cm. What is the height of the water?
一个圆锥形容器，底面半径是4厘米，高9厘米，将它装满水后，倒入底面半径是2厘米的圆柱形容器中，水的高度是多少？
<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">3.14 * 16 * 9 * (1/3)</gadget>
<output>150.72</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4</gadget>
<output>12.56</output>

<gadget id="calculator">150.72 / 12.56</gadget>
<output>12</output>

<result>12</result>