A cuboid bucket with a base area of 2 decimeters is filled with water. A cone with a base radius of 3 cm and a height of 30 cm is placed in the water and is completely submerged in water. If the cone is taken out of the bucket, How many centimeters will the water level drop.
一个底面积是2平方分米的长方体水桶中装有水，水中放有一个底面半径是3厘米，高为30厘米的圆锥体，且完全浸没在水中，如果把圆锥体从水桶里取出后，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">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">2 * 100</gadget>
<output>200</output>

<gadget id="calculator">30 / 200</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">(1/3) * 3.14 * 9 * (3/20)</gadget>
<output>1.413</output>

<result>1.413</result>