Given that the circumference of a circle is 28.26 cm, what is the area of the circle?
已知圆的周长是28.26cm，那么圆的面积是多少．
<gadget id="calculator">28.26 / 3.14</gadget>
<output>9</output>

<gadget id="calculator">9 / 2</gadget>
<output>9/2 = around 4.5</output>

<gadget id="calculator">(9/2) ** 2</gadget>
<output>81/4 = around 20.25</output>

<gadget id="calculator">3.14 * (81/4)</gadget>
<output>63.585</output>

<result>63.585</result>