The roller of a road roller is a cylinder with a width of 2 meters and a base radius of 1 meter. How many square meters is the area of the road that it rolls for one week?
一辆压路机的滚筒是个圆柱体，它的宽是2米，底面半径是1米．求它滚动一周压路的面积是多少平方米？
<gadget id="calculator">3.14 * 1 * 2</gadget>
<output>6.28</output>

<result>6.28</result>