The front wheel of a road roller is cylindrical, the wheel width is 20dm, and the radius of the bottom surface is 6dm. If the front wheel rotates once, what is the area of the road?
一台压路机的前轮是圆柱形，轮宽20dm，底面半径为6dm，前轮转动一周，压路的面积是多少？
<gadget id="calculator">3.14 * 6 * 2 * 20</gadget>
<output>753.6</output>

<result>753.6</result>