A piece of rectangular paper, its length is 8cm, its width is 6cm, use it to cut the largest circle, what is the area of this circle?
一张长方形纸，它的长是8cm，宽是6cm，用它剪一个最大的圆，这个圆的面积是多少？
<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>