The hour hand of a table clock is 4 cm long. After 6 hours, what is the area swept by the tip of the hour hand?
一座台钟的时针长4厘米，经过6小时，时针的尖端扫过的面积是多少．
<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">16 / 2</gadget>
<output>8</output>

<gadget id="calculator">3.14 * 8</gadget>
<output>25.12</output>

<result>25.12</result>