The minute hand of an alarm clock is 8 cm long. From 8:00 am to 12:00 noon, how many square centimeters does the minute hand sweep?
某闹钟的分针长8厘米，从早上8：00到时中午12：00，分针扫过的面积是多少平方厘米？
<gadget id="calculator">8 ** 2</gadget>
<output>64</output>

<gadget id="calculator">3.14 * 64 * 4</gadget>
<output>803.84</output>

<result>803.84</result>