The diameter of the largest Ferris wheel in the world is 150 meters. If you sit on it and rotate it once, how many meters does it take to turn in the air?
世界上最大的摩天轮直径是150米，坐着它转动一周，大约是空中转过多少米？
<gadget id="calculator">150 * 3.14</gadget>
<output>471</output>

<result>471</result>