The roller of a road roller is 1.2 meters long and the diameter of the bottom surface is 6 decimeters. How many square meters of road surface does the roller roll over once?
一台压路机的滚筒长1.2米，底面直径是6分米，这个压路机滚筒滚动一周，压过的路面是多少平方米？
<gadget id="calculator">1.844 * 1.2</gadget>
<output>2.2128</output>

<result>2.2128</result>