The minute hand of a wall clock is 15 cm long. What is the distance traveled by the tip of the minute hand after 45 minutes?
一只挂钟的分针长15cm，经过45分后分针尖端所走的路程是多少cm．
<gadget id="calculator">45 / 60</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">3.14 * 2 * 15 * (3/4)</gadget>
<output>70.65</output>

<result>70.65</result>