36 students form a circle to play games on the playground. The distance between every two adjacent students is 2 meters. What is the circumference of this circle in meters?
36个同学在操场上围成一个圆圈做游戏，每相邻两个同学之间都是2米，这个圆圈的周长是多少米？
<gadget id="calculator">36 * 2</gadget>
<output>72</output>

<result>72</result>