If the minute hand of a clock with a length of 1 cm from the end of the needle to the center of the axis passes through 30 minutes, what is the length of the arc traversed by the end of the needle in centimeters?
针端到轴心长度为1厘米的时钟分针经过30分钟，针端转过的弧长是多少厘米．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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

<result>3.14</result>