12 children form a circle to play the game of throwing handkerchiefs. Every two children are separated by 2 meters. What is the circumference of the circle in meters?
12位小朋友围成一个圆圈做丢手绢的游戏，每两位小朋友相隔2米，这个圆圈的周长是多少米．
<gadget id="calculator">2 * 12</gadget>
<output>24</output>

<result>24</result>