A circular goldfish pond, with a radius of 1.2 meters, is the length of the 4 circles in meters.
一个圆形金鱼池，半径1.2米，绕4周的长是多少米．
<gadget id="calculator">3.14 * 1.2 * 2 * 4</gadget>
<output>30.144</output>

<result>30.144</result>