The roller of the road roller is a cylinder with a diameter of 1 meter and a length of 1.5 meters. How much area of road surface can it press for one round of rolling?
压路机的滚筒是一个圆柱形，直径是1米，长1.5，米，每滚动一周能压多少面积的路面？
<gadget id="calculator">3.14 * 1 * 1.5</gadget>
<output>4.71</output>

<result>4.71</result>