The length of the hour hand of a clock is 10 cm, how many cm does the tip of the hour hand move after one day and night?
一面钟时针长10cm，经过一昼夜时针的尖端共走了多少cm．
<gadget id="calculator">2 * 3.14 * 10</gadget>
<output>62.8</output>

<gadget id="calculator">62.8 * 2</gadget>
<output>125.6</output>

<result>125.6</result>