Divide a circular piece of paper into several equal parts, and form an approximate rectangle with the radius as the width. The perimeter of the rectangle is 24.84 cm. What is the area of the original circular piece of paper?
把一个圆形纸片平均分成若干份，拼成一个半径作宽的近似的长方形，长方形的周长是24.84厘米，原来圆形纸片的面积是多少？
<gadget id="calculator">1 + 3.14</gadget>
<output>4.14</output>

<gadget id="calculator">24.84 / 2 / 4.14</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>