Divide a circle into several equal parts along the radius, and then put together an approximate rectangle. The circumference of this rectangle is measured to be 82.8 cm. What is the area of this circle in square centimeters?
把一个圆沿半径分成若干等份，然后拼成一个近似的长方形，量得这个长方形的周长是82.8厘米，这个圆韵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>