If the arc subtended by a central angle of 60° is 10 cm long, what is the circumference of the circle it is in?
如果60°圆心角所对的弧长为10厘米，那么它所在的圆的周长是多少厘米．
<gadget id="calculator">360 / 60</gadget>
<output>6</output>

<gadget id="calculator">6 * 10</gadget>
<output>60</output>

<result>60</result>