A conical plumb weight with a bottom diameter of 4 cm and a height of 9 cm is immersed in a cylindrical container filled with water and the bottom circumference is 25.12 cm. When the plumb weight is taken out of the water, the water level in the container drops. How many centimeters?
把一个底面直径是4厘米，高是9厘米的圆锥形铅锤沉浸在一个注满水的底面周长是25.12厘米的圆柱形容器中，当铅锤从水中取出后，容器中的水面下降了几厘米？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

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

<gadget id="calculator">25.12 / 3.14 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">3.14 * 16</gadget>
<output>50.24</output>

<gadget id="calculator">9 / 50.24</gadget>
<output>0.17914</output>

<gadget id="calculator">(1/3) * 3.14 * 4 * 0.17914</gadget>
<output>0.749999</output>

<result>0.749999</result>