A cylindrical bucket with a height of 5 decimeters and a diameter of 20 cm at the bottom is filled with water. An iron cylinder with a diameter of 18 cm at the bottom and a height of 5 cm is placed in the water. When the iron cone is taken out, it will How has it changed? How is the result?
一个高5分米，底面直径为20厘米的圆柱形水桶里装满水，水中放着一个底面直径为18厘米，高为5厘米的铁质圆柱体，当这个铁质圆锥体取出后，会发生怎样的变化？结果如何？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">18 / 2</gadget>
<output>9</output>

<gadget id="calculator">9 ** 2</gadget>
<output>81</output>

<gadget id="calculator">(1/3) * 3.14 * 81 * 5</gadget>
<output>423.9</output>

<result>423.9</result>