A Ferris wheel is turned, the distance between the highest point and the lowest point is 10 meters, how many meters is it to take this Ferris wheel for one revolution?
一个摩天轮转起来，最高点和最低点之间的距离是10米，坐这个摩天轮转一圈是多少米．
<gadget id="calculator">3.14 * 10</gadget>
<output>31.4</output>

<result>31.4</result>