The hour hand of a watch is 1.8 centimeters long, how many meters does its needle point travel in a day and night.
一块手表的时针长1.8厘米，它的针尖一昼夜走多少米．
<gadget id="calculator">2 / 100</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">3.14 * 1.8 * 2 * (1/50)</gadget>
<output>0.22608</output>

<result>0.22608</result>