There are 50 students in class 4 and 3. In the physical education class, the students form a circle in the playground to play games. The distance between two adjacent students is 2 meters. How long is this circle in meters?
四3班有50名学生，体育课上同学们在操场围成一个圆圈做游戏，每相邻两名同学之间的距离是2米．这个圆圈一周长多少米？
<gadget id="calculator">2 * 50</gadget>
<output>100</output>

<result>100</result>