The drum of a road roller is 1.2 meters wide and 0.8 meters in diameter. If it rolls 10 times, what is the area of the road in square meters?
一台压路机的滚筒宽1.2米，直径为0.8米．如果它滚动10周，压路的面积是多少平方米．
<gadget id="calculator">3.14 * 0.8 * 10 * 1.2</gadget>
<output>30.144</output>

<result>30.144</result>