Cut a circle and assemble it into an approximate rectangle (as shown in the figure). The perimeter of this rectangle is 24.84cm. Find the area of this circle.
把一个圆剪开拼成一个近似的长方形，(如图)，这个长方形的周长为24.84cm，求这个圆的面积．
<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">3.14 * 9</gadget>
<output>28.26</output>

<result>28.26</result>