The minute hand of a clock face is 5cm long, and the hour hand is 3cm long; how many cm does the tip of the minute hand move in a circle?
一个钟面的分针长5cm，时针长3cm；分针的尖端走一圈走多少cm
<gadget id="calculator">3.14 * 2 * 5</gadget>
<output>31.4</output>

<result>31.4</result>