The front wheel of the road roller is cylindrical, with a base diameter of 1 m and a wheel width of 1.5 m. How many square meters is the area of the road that the front wheel rolls over?
压路机的前轮是圆柱形，底面直径1米，轮宽1.5米．前轮滚动一周，压过的路面的面积是多少平方米？
<gadget id="calculator">3.14 * 1 * 1.5</gadget>
<output>4.71</output>

<result>4.71</result>