On a circular clock face, the minute hand is 6 cm long. What is the area swept by the minute hand in one revolution?
在圆形钟面上，分针长6厘米，它转了一圈，扫过的面积是多少平方厘米．
<gadget id="calculator">6 ** 2</gadget>
<output>36</output>

<gadget id="calculator">3.14 * 36</gadget>
<output>113.04</output>

<result>113.04</result>