A road roller has a cylindrical front wheel with a 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 rolls once?
一种压路机的前轮是圆柱形状的，轮宽1.6米，直径0.8米．前轮滚动一周，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>