The minute hand of a clock is 8 cm long. After two hours, what is the area swept by the minute?
一个时钟的分针长8cm，经过两小时后，分钟扫过的面积是多少．
<gadget id="calculator">8 ** 2</gadget>
<output>64</output>

<gadget id="calculator">3.14 * 64 * 2</gadget>
<output>401.92</output>

<result>401.92</result>