The cross-sectional area of the front wheel of a road roller is a circle, its diameter is 1 meter, and the wheel width is 2 meters. If the front wheel rotates 10 times per minute, how many meters can it advance per minute?
一台压路机前轮的横截面积是个圆，它的直径是1米，轮宽2米．如果前轮每分钟转10周，那么每分钟可前进多少米？
<gadget id="calculator">3.14 * 1 * 10</gadget>
<output>31.4</output>

<result>31.4</result>