Cut out the largest circle from a rectangular iron sheet with a length of 9dm and a width of 6dm. What is the area of this circle in square decimeters?
从一块长9dm，宽6dm的长方形铁皮上剪下一个最大的圆，这个圆的面积是多少平方分米？
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">3.14 * 9</gadget>
<output>28.26</output>

<result>28.26</result>