steel ball is put into a cylindrical bucket filled with water, and 3.14 liters of water are discharged. If the steel ball is cast into a cylinder with a bottom diameter of 4 decimeters, what is its height in decimeters?
把一个钢球放入装满水的圆柱形桶里，结果排出3.14升水，如果将钢球铸成底面直径为4分米的圆柱，它的高是多少分米．
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

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

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

<gadget id="calculator">3.14 / 12.56</gadget>
<output>0.25</output>

<result>0.25</result>