A conical sand pile has a bottom circumference of 18.84m and a height of 4m. How long can this pile of sand be used to pave a road with a thickness of 2cm on a road with a width of 10m?
一个圆锥形沙堆，底面周长是18.84m，高4m，用这堆沙在10m宽的公路上铺2cm厚的路面，能铺多长？
<gadget id="calculator">2 * 3.14</gadget>
<output>6.28</output>

<gadget id="calculator">18.84 / 6.28</gadget>
<output>3</output>

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

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">(1/3) * 3.14 * 9 * 4</gadget>
<output>37.68</output>

<gadget id="calculator">10 * 0.02</gadget>
<output>0.2</output>

<gadget id="calculator">37.68 / 0.2</gadget>
<output>188.4</output>

<result>188.4</result>