Put water into a cylindrical glass with a bottom diameter of 20cm. A conical plumb weight with a bottom diameter of 6cm and a height of 10cm is placed in the water. How many centimeters will the water level drop in the glass after taking it out?
往一个底面直径是20cm的圆柱形玻璃杯中装水，水里放着一个底面直径为6cm，高为10cm的圆锥形铅锤，取出后杯里的水面会下降多少厘米？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100</gadget>
<output>314</output>

<gadget id="calculator">10 / 314</gadget>
<output>5/157 = around 0.031847</output>

<gadget id="calculator">(1/3) * 3.14 * 9 * (5/157)</gadget>
<output>0.3</output>

<result>0.3</result>