The front wheel of a road roller is cylindrical, the width of the wheel is 2 meters, and the diameter is 0.8 meters. How many square meters is the area of the road when the front wheel rotates once?
一辆压路机的前轮是圆柱形，轮宽2米，直径是0.8米．前轮转动一周，压路的面积是多少平方米？
<gadget id="calculator">3.14 * 0.8 * 2</gadget>
<output>5.024</output>

<result>5.024</result>