The front wheel of a road roller has a width of 2m and a diameter of 6m. If the front wheel turns 10 revolutions per minute, how many square meters does the road roller cover in 30 minutes?
一台压路机的前轮宽为2m，直径为6m，如果前轮每分钟转10转，那么这台压路机30分压路的面积有多少平方米？
<gadget id="calculator">3.14 * 6</gadget>
<output>18.84</output>

<gadget id="calculator">18.84 * 2 * 10 * 30</gadget>
<output>11_304</output>

<result>11_304</result>