A road roller has a front wheel with a diameter of 1.2 meters and a wheel width of 2 meters. How many square meters is the road surface area that the front wheels of this roller roll over for one week?
一秞压路机的前轮直径1.2米，轮宽2米．这种压路机前轮滚动一周压过的路面面积是多少平方米？
<gadget id="calculator">3.14 * 1.2 * 2</gadget>
<output>7.536</output>

<result>7.536</result>