The hour hand of a certain clock is 8 cm long, how many cm does the tip of the hour hand travel from morning to noon?
某时钟的时针长8cm，凌晨到正午时针的尖端走了多少cm．
<gadget id="calculator">3.14 * 2 * 8</gadget>
<output>50.24</output>

<result>50.24</result>