The radius of the bottom surface of the conical coal pile is 3 meters, and the height is 2 meters. If it is paved on a road with a width of 4 meters, it needs to be paved with a thickness of 0.5 meters. How long can it be paved?
圆锥形煤堆底面半径3米，高2米，用它铺在宽4米的马路上，要铺0.5米厚，那么可以铺多长？
<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 * 2</gadget>
<output>18.84</output>

<gadget id="calculator">4 * 0.5</gadget>
<output>2</output>

<gadget id="calculator">18.84 / 2</gadget>
<output>9.42</output>

<result>9.42</result>