A conical wheat pile has a base circumference of 15.7m and a height of 1.8m. If these wheats are packed into a cylindrical grain shed, which only accounts for 1/4 of the grain shed, the bottom area of the known grain shed is 10m**2, how many meters is the height of the grain shed?
一个圆锥形麦堆，量得底面周长是15.7m，高是1.8m．如果把这些小麦装入一个圆柱形粮屯里，只占粮屯的(1/4)，已知粮屯的底面积是10m**2，粮屯的高是多少米？
<gadget id="calculator">15.7 / 3.14 / 2</gadget>
<output>2.5</output>

<gadget id="calculator">2.5 ** 2</gadget>
<output>6.25</output>

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

<gadget id="calculator">3.14 * 6.25 * 1.8 * (1/3)</gadget>
<output>11.775</output>

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

<gadget id="calculator">11.775 / (1/4) / 10</gadget>
<output>4.71</output>

<result>4.71</result>