conical iron block with a base radius of 4 cm and a height of 9 cm is recast into a cylinder with a base radius of 2 cm. What is the height of the cast cylinder in cm?
一个圆锥形铁块，底面半径是4厘米，高9厘米，将它重新熔铸成一个底面半径是2厘米的圆柱体，求熔铸后的圆柱体的高是多少厘米？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

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

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

<gadget id="calculator">9 / 12.56</gadget>
<output>0.716561</output>

<gadget id="calculator">(1/3) * 3.14 * 16 * 0.716561</gadget>
<output>12.000008</output>

<result>12.000008</result>