A road roller has a front wheel with a diameter of 180cm and a width of 2m. When moving forward, it turns 5 revolutions per minute. What is the area that the road roller advances per minute?
一种压路机的前轮直径是180cm、宽2m，前进时每分钟转5周，压路机每分钟前进的面积是多少？
<gadget id="calculator">180 / 100</gadget>
<output>9/5 = around 1.8</output>

<gadget id="calculator">3.14 * (9/5) * 2 * 5</gadget>
<output>56.52</output>

<result>56.52</result>