A cylindrical granary has a base radius of 3m measured from the inside and contains wheat 2m high. If the wheat is piled into a conical pile, the radius is 2m. How tall is this wheat cone?
一个圆柱形的粮仓，从里面量得底面半径为3m，装有2m高的小麦，若将这些小麦堆成个圆锥形的麦堆，半径为2m．这个圆锥形麦堆有多高？
<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

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

<gadget id="calculator">2 / (1/3) / 12.56</gadget>
<output>0.477707</output>

<gadget id="calculator">3.14 * 9 * 0.477707</gadget>
<output>13.5</output>

<result>13.5</result>