A cylindrical cup with a base diameter of 20 cm is filled with water. A conical iron block with a ground diameter of 10 cm and a height of 18 cm is submerged in the water. When the iron block is taken out of the cup, the water level in the cup will drop. how many centimeters?
一个底面直径是20厘米的圆柱形杯中装有水，水里浸没一个地面直径是10厘米，高是18厘米的圆锥体铁块，当铁块从杯中取出时，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">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</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">18 / 314</gadget>
<output>9/157 = around 0.057325</output>

<gadget id="calculator">(1/3) * 3.14 * 25 * (9/157)</gadget>
<output>1.5</output>

<result>1.5</result>