Cut a circular piece of paper into several small fan shapes along the radius, and assemble them into an approximate rectangle. If the perimeter of the rectangle is 33.12 cm, what is the area of the circle in square centimeters?
把一个圆形纸片沿半径剪成若干个小扇形，拼成一个近似的长方形．这个长方形的周长是33.12厘米，那么这个圆的面积是多少平方厘米．
<gadget id="calculator">2 * 3.14</gadget>
<output>6.28</output>

<gadget id="calculator">6.28 + 2</gadget>
<output>8.28</output>

<gadget id="calculator">33.12 / 8.28</gadget>
<output>4</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">3.14 * 16</gadget>
<output>50.24</output>

<result>50.24</result>