The front wheel of a road roller is cylindrical, the width of the wheel is 2m, and the diameter is 1.2m. If the front wheel rotates once, what is the area of the road to be rolled?
一台压路机的前轮是圆柱形的，轮宽2m，直径1.2m，前轮转动一周，压路的面积是多少．
<gadget id="calculator">3.14 * 1.2 * 2</gadget>
<output>7.536</output>

<result>7.536</result>