Divide a circular piece of paper into several equal pieces, cut them out, and assemble them into an approximate rectangle. The perimeter of the rectangle is 8.28 cm. What is the area of this circular piece of paper in square centimeters?
把一个圆形纸片等分成若干份后剪开，拼成一个近似长方形，长方形的周长为8.28厘米，这个圆形纸片的面积是多少平方厘米？
<gadget id="calculator">1 + 3.14</gadget>
<output>4.14</output>

<gadget id="calculator">8.28 / 2 / 4.14</gadget>
<output>1</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1</gadget>
<output>3.14</output>

<result>3.14</result>