The minute hand of a clock is 10 cm long, what is the area swept by the minute hand from 8 am to 9 am?
某钟表的分针长10厘米，从上午8时到上午9时分针扫过的面积是多少平方厘米．
<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100</gadget>
<output>314</output>

<result>314</result>