A conical rice pile has a base radius of 2 meters and a height of 3 meters. If these rice grains are put into a cylindrical grain depot, the bottom area of the grain depot is known to be 6.28 square meters, how many meters is the height of the grain depot?
一个圆锥形的稻谷堆，底面半径是2米，高是3米．如果把这些稻谷装入一个圆柱形的粮库里，已知粮库的底面积是6.28平方米，求粮库的高是多少米？
<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">(1/3) * 3.14 * 4 * 3</gadget>
<output>12.56</output>

<gadget id="calculator">12.56 / 6.28</gadget>
<output>2</output>

<result>2</result>