The roller of a road roller is 3 meters wide and 1.8 meters in diameter. If it rolls 20 times, what is the area to be rolled?
一台压路机的滚筒宽3米，直径为1.8米，如果它滚动20周，压路的面积是多少？
<gadget id="calculator">3.14 * 1.8 * 20 * 3</gadget>
<output>339.12</output>

<result>339.12</result>