Divide a circle into several small sectors on average, and then put together an approximate rectangle. The perimeter of this rectangle is 24.84 cm. What is the area of this circle in square centimeters?
把一个圆平均分成若干个小扇形，再拼成一个近似的长方形，这个长方形的周长是24.84厘米，这个圆的面积是多少平方厘米．
<gadget id="calculator">3.14 * 2</gadget>
<output>6.28</output>

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

<gadget id="calculator">24.84 / 8.28</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>