The hour hand of a clock is 8 cm long. From 8 am to 8 pm, how many square centimeters does the hour hand sweep?
一个时钟的时针长8厘米，从上午8时到晚上8时，时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</gadget>
<output>200.96</output>

<result>200.96</result>