Draw the largest circle inside a square with a circumference of 32 decimeters. What is the area of this circle equal to the area of the square?
在一个周长为32分米的正方形内画一个最大的圆，这个圆的面积是正方形面积的多少．
<gadget id="calculator">32 / 4</gadget>
<output>8</output>

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">3.14 * 16</gadget>
<output>50.24</output>

<gadget id="calculator">8 * 8</gadget>
<output>64</output>

<gadget id="calculator">50.24 / 64</gadget>
<output>0.785</output>

<result>0.785</result>