The radius of the circle where an arc is located is 12 cm, and the central angle subtended by the arc is 60°, what is the length of the arc in cm?
一段弧所在的圆的半径为12厘米，弧所对的圆心角为60°，那么这段弧的长为多少厘米．
<gadget id="calculator">60 / 360</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">3.14 * 2 * 12 * (1/6)</gadget>
<output>12.56</output>

<result>12.56</result>