The minute hand of a clock is 10 cm long. From 1 o'clock to 2 o'clock, what is the area swept by the minute hand in square centimeters?
某钟表的分针表10厘米，从1时至2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>