The hour hand of a wall clock is 6 cm long, how many square centimeters does it cover in one day and night?
一个挂钟的时针长6厘米，一昼夜扫过的面积是多少平方厘米？
<gadget id="calculator">6 ** 2</gadget>
<output>36</output>

<gadget id="calculator">3.14 * 36 * 2</gadget>
<output>226.08</output>

<result>226.08</result>