The roller of the road roller is a cylinder with a length of 1.8 meters and a diameter of 1 meter. Calculated at 20 revolutions per minute, how many square meters of road surface can this road roller press in one minute?
压路机的滚筒是一个圆柱体，长1.8米，直径是1米．按每分钟转20圈计算，这台压路机1分钟能压路面多少平方米？
<gadget id="calculator">3.14 * 1 * 20 * 1.8</gadget>
<output>113.04</output>

<result>113.04</result>