The minute hand of a clock is 10 cm long. From 2 o'clock to 4 o'clock, how many centimeters did the tip of the minute hand travel.
某钟表的分针长10厘米．从2时到4时，分针的尖端走过了多少厘米．
<gadget id="calculator">4 - 2</gadget>
<output>2</output>

<gadget id="calculator">2 * 3.14 * 10 * 2</gadget>
<output>125.6</output>

<result>125.6</result>