The length of the hour hand of a big clock is 60 cm, and the clock moves for 3 hours, what is the area in square centimeters that the hour hand crosses?
一个大钟时针长60cm，大钟走了3个小时，时针划过的面积是多少平方厘米？
<gadget id="calculator">60 ** 2</gadget>
<output>3_600</output>

<gadget id="calculator">3 / 12</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">3.14 * 3_600 * (1/4)</gadget>
<output>2_826</output>

<result>2_826</result>