The diameter of the front wheel of a road roller is 6 decimeters, if it turns 3 times per minute, how much does it advance per minute?
一种压路机的前轮直径是6分米，如果它每分钟转3周，它每分钟前进多少？
<gadget id="calculator">3.14 * 6 * 3</gadget>
<output>56.52</output>

<result>56.52</result>