The minute hand of a clock is 10 cm long, how many centimeters does the tip of the minute hand travel from 2 o'clock to 5 o'clock?
一个钟表的分针长10厘米，从2时走到5时，分针针尖走过了多少厘米．
<gadget id="calculator">5 - 2</gadget>
<output>3</output>

<gadget id="calculator">2 * 3.14 * 10 * 3</gadget>
<output>188.4</output>

<result>188.4</result>