A conical sand pile has a base circumference of 18.84 meters and a height of 2 meters. Spread the sand evenly on a path that is 78.5 meters long and 5 meters wide. What is the thickness of the sand in centimeters?
一个圆锥形沙堆的底面周长是18.84米，高2米．将这些沙子均匀的铺在长78.5米，宽5米的小路上，沙子的厚度是多少厘米？
<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">2 / 157</gadget>
<output>2/157 = around 0.012739</output>

<gadget id="calculator">(1/3) * 3.14 * 9 * (2/157) * 100</gadget>
<output>12</output>

<result>12</result>