A square iron plate with a circumference of 24 decimeters, cut out the largest circle, what is the area of the circle in square decimeters (take 3.14 for π).
一块周长是24分米的正方形铁板，剪下一个最大的圆，圆的面积是多少平方分米(π取3.14)．
<gadget id="calculator">24 / 4</gadget>
<output>6</output>

<gadget id="calculator">6 / 2</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>