The roller of a road roller is a cylinder with a diameter of 1 meter at the bottom and a length of 2 meters. How much area of road surface can be pressed per rolling week?
压路机的滚筒是一个圆柱体，它的底面直径是1米，长2米．每滚动一周能压多大面积的路面？
<gadget id="calculator">3.14 * 1 * 2</gadget>
<output>6.28</output>

<result>6.28</result>