A road roller is 2 meters long and 1.2 meters in diameter. If it rolls 20 times, how many square meters is the rolling area?
一台压路机滚筒长2米，直径是1.2米，如果它滚动20周，压路面积是多少平方米？
<gadget id="calculator">3.14 * 1.2 * 2 * 20</gadget>
<output>150.72</output>

<result>150.72</result>