The second hand of a clock is 8 cm long. After 45 seconds, how many centimeters does the tip of the second hand move?
一座钟的秒针长8厘米，经过45秒的时间，秒针针尖移动了多少厘米？
<gadget id="calculator">45 / 60</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">3.14 * 8 * 2 * (3/4)</gadget>
<output>37.68</output>

<result>37.68</result>