The minute hand of a clock is 10 cm long, what is the distance traveled by the tip of the minute hand from 12 o'clock to 3 o'clock.
有一只钟的分针长10厘米，从12点到3点分针尖端经过的路程是多少．
<gadget id="calculator">2 * 3.14 * 10 * 3</gadget>
<output>188.4</output>

<result>188.4</result>