The minute hand of a wall clock is 3 centimeters long, how many centimeters does the tip of the hand make in one circle?
一个挂钟分针长3厘米，它的尖端走了一圈是多少厘米．
<gadget id="calculator">3.14 * 6</gadget>
<output>18.84</output>

<result>18.84</result>