A Ferris wheel has a radius of about 10 meters. If you sit on it and turn it once, how many meters does it turn in the air?
一个摩天轮的半径大约10米，坐着它转动一周，大约在空中转过多少米？
<gadget id="calculator">2 * 3.14 * 10</gadget>
<output>62.8</output>

<result>62.8</result>