The diameter of a circular flowerbed is 10 meters, and a fence is to be built around the flowerbed, how many meters is the length of the fence? ?
一个圆形花圃的直径为10米，要在花圃的周围做一个围栏，求围栏的长度有多少米？？
<gadget id="calculator">3.14 * 10</gadget>
<output>31.4</output>

<result>31.4</result>