The hour hand of a clock is 4 decimeters long, how many decimeters does it travel in a day and night?
一座钟的时针长4分米，它一昼夜所走的路程是多少分米．
<gadget id="calculator">3.14 * 4 * 2 * 2</gadget>
<output>50.24</output>

<result>50.24</result>