The front wheel of a road roller is cylindrical, with a wheel width of 1.6 meters and a diameter of 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1.6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 * 1.6</gadget>
<output>4.0192</output>

<result>4.0192</result>