In a cylindrical container with a bottom radius of 2 decimeters, 3 decimeters of water is filled, and a cone with a bottom surface radius of 2 decimeters is put into the water, and it is completely submerged. At this time, the water depth is 3.5 decimeters. How many decimeters?
在一个底面半径2分米的圆柱形容器中，装有3分米深的水，把一个底面半径2分米的圆锥放入水中，全部被淹没，这时水深为3.5分米这个圆锥的高是多少分米？
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.5 - 3</gadget>
<output>0.5</output>

<gadget id="calculator">3.14 * 4</gadget>
<output>12.56</output>

<gadget id="calculator">3 / 12.56</gadget>
<output>0.238854</output>

<gadget id="calculator">3.14 * 4 * 0.5 * 0.238854</gadget>
<output>1.500003</output>

<result>1.500003</result>