Divide a circular piece of paper into several equal parts and assemble it into an approximate rectangle whose width is the radius. It is known that the perimeter of the rectangle is 49.68 centimeters. What is the area of the circular piece of paper in square centimeters?
把一个圆形的纸片分成若干等份，拼成一个以半径为宽的近似长方形，已知长方形的周长是49.68厘米，圆形纸片的面积是多少平方厘米．
<gadget id="calculator">6 ** 2</gadget>
<output>36</output>

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

<result>113.04</result>