A conical pile of wheat has a base radius of 3 meters and a height of 2 meters. If these wheats are packed into a cylindrical grain storage, it only accounts for (4/9) of the grain storage volume. It is known that the bottom area of the grain store is 9 square meters, how many meters is the height of the grain store?
一个圆锥形的麦堆，底面半径是3米，高是2米．如果把这些小麦装入一个圆柱形粮囤，只占粮囤容积的(4/9)．已知粮囤的底面积是9平方米，粮囤的高是多少米？
<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">3.14 * 9 * 2 * (1/3)</gadget>
<output>18.84</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">18.84 / (4/9) / 9</gadget>
<output>4.71</output>

<result>4.71</result>