The front wheel of a road roller is cylindrical, with a wheel width of 2 meters and a diameter of 1 meter. If it turns 20 revolutions per minute, how many square meters of road surface can this road roller press per minute?
一台压路机的前轮是圆柱形，轮宽2米，直径1米，如果每分钟转20周，这台压路机每分钟可压路面多少平方米？
<gadget id="calculator">3.14 * 1 * 2 * 20</gadget>
<output>125.6</output>

<result>125.6</result>