A cylindrical iron block with a bottom radius of 2 decimeters and a height of 4 decimeters is forged into a rectangular parallelepiped iron block with a bottom side length of 4 decimeters. What is the height in decimeters?
将一个底面半径2分米，高4分米的圆柱体铁块锻造成底面边长是4分米的长方体铁块，高应是多少分米．
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

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

<gadget id="calculator">4 / 16</gadget>
<output>1/4 = around 0.25</output>

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

<result>3.14</result>