On a circular clock face, the minute hand is 8cm long, what is the area it sweeps in one revolution in cm**2.
圆形钟面上，分针长8cm，它转一周扫过的面积是多少cm**2．
<gadget id="calculator">8 ** 2</gadget>
<output>64</output>

<gadget id="calculator">3.14 * 64</gadget>
<output>200.96</output>

<result>200.96</result>