Divide a circle into several (even number) parts on average along the radius, and put together an approximate rectangle. The perimeter of this rectangle is 82.8 cm. What is the area of this circle in square centimeters?
把一个圆沿半径平均分成若干(偶数)份，再拼成一个近似的长方形，这个长方形的周长是82.8厘米，这个圆的面积是多少平方厘米？
<gadget id="calculator">1 + 3.14</gadget>
<output>4.14</output>

<gadget id="calculator">82.8 / 2 / 4.14</gadget>
<output>10</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100</gadget>
<output>314</output>

<result>314</result>