The minute hand is 6cm long, what is the area it sweeps in one hour in cm**2.
分针长6cm，它一小时扫过的面积为多少cm**2．
<gadget id="calculator">6 ** 2</gadget>
<output>36</output>

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

<result>113.04</result>