The minute hand of a wall clock is 10 centimeters long, how many centimeters does the tip of the hand travel in one circle?
一个挂钟分针长10厘米，它的尖端走了一圈是多少厘米．
<gadget id="calculator">2 * 3.14 * 10</gadget>
<output>62.8</output>

<result>62.8</result>