The minute hand of a wall clock is 5 cm long. After half an hour, how many centimeters does the tip of the minute hand travel?
一个挂钟分针长5厘米，经过半小时，分针的尖端走了多少厘米．
<gadget id="calculator">3.14 * 5</gadget>
<output>15.7</output>

<result>15.7</result>