The roller of the road roller is 1.2 meters long and 0.8 meters in diameter. When rolling the road, it rolls 100 times. How many square meters is the rolling area?
压路机的滚筒长1.2米，直径为0.8米，压路时滚100周，压路面积是多少平方米？
<gadget id="calculator">3.14 * 0.8 * 1.2 * 100</gadget>
<output>301.44</output>

<result>301.44</result>