The minute hand of a watch is 1.5 cm long. After 30 minutes, what is the distance traveled by the tip of the minute hand in cm?
一只手表的分针长1.5cm，经过30分钟，分针的尖端所走的路程是多少cm．
<gadget id="calculator">1.5 / 2</gadget>
<output>0.75</output>

<gadget id="calculator">2 * 3.14 * 0.75</gadget>
<output>4.71</output>

<result>4.71</result>