An oil tanker full of asphalt is a cylinder with a ground radius of 2 meters and a length of 4 meters. Now all the asphalt is spread on a road with a width of 10 meters and a thickness of 2 centimeters. How many meters can be paved?
一辆装满沥青的油罐车是罐体地面半径为2米，长为4米的圆柱，现将所有沥青铺在10米宽的公路上，厚度2厘米，能铺多少米？
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">2 / 100</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">10 * (1/50)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">4 / (1/5)</gadget>
<output>20</output>

<gadget id="calculator">3.14 * 4 * 20</gadget>
<output>251.2</output>

<result>251.2</result>