A cone-shaped pile of sand has a bottom circumference of 125.6 meters and a height of 4.5 meters. If this pile of sand is spread on a road with a width of 5 meters and a road surface with a thickness of 4 cm, how long can it be paved?
一个圆锥形沙堆底面周长125.6米，高4.5米，把这堆沙子铺在宽5米的路上，铺4厘米厚的路面，能铺多长？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">125.6 / 3.14 / 2</gadget>
<output>20</output>

<gadget id="calculator">20 ** 2</gadget>
<output>400</output>

<gadget id="calculator">5 * 0.02</gadget>
<output>0.1</output>

<gadget id="calculator">4.5 / 0.1</gadget>
<output>45</output>

<gadget id="calculator">(1/3) * 3.14 * 400 * 45</gadget>
<output>18_840</output>

<result>18_840</result>