The front wheel of a road roller is cylindrical, the width of the wheel is 1.6 meters, and the diameter is 8 decimeters. 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8分米．前轮转动一周，压路的面积是多少平方米？
<gadget id="calculator">8 / 10</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">3.14 * (4/5) * 1.6</gadget>
<output>4.0192</output>

<result>4.0192</result>