The minute hand of a round wall clock is 10 cm long. After 30 minutes, how far is the tip of the minute hand traveling?
一个圆形挂钟的分针长10cm，经过30分钟，分针的尖端走的路程是多少米？
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">2 * 3.14 * 5</gadget>
<output>31.4</output>

<result>31.4</result>