If a cone with a diameter of 12 cm and a height of 18 cm is placed in a cylindrical cup with a bottom diameter of 24 cm, how many centimeters will the water level drop?
底直径24cm的柱形杯中放一个直径12cm，高18cm的锥取出后，水面下降多少cm？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">6 ** 2</gadget>
<output>36</output>

<gadget id="calculator">(1/3) * 3.14 * 36 * 18</gadget>
<output>678.24</output>

<gadget id="calculator">24 / 2</gadget>
<output>12</output>

<gadget id="calculator">12 ** 2</gadget>
<output>144</output>

<gadget id="calculator">3.14 * 144</gadget>
<output>452.16</output>

<gadget id="calculator">678.24 / 452.16</gadget>
<output>1.5</output>

<result>1.5</result>