10 students hold hands and form a circle. The distance between every two students on the circle is 1.256 meters. What is the circumference of the circle?
10个同学手拉手围成一个圆，每两个同学在圆上相隔的距离都是1.256米，围成的圆的周长是多少米．
<gadget id="calculator">1.256 * 10</gadget>
<output>12.56</output>

<result>12.56</result>