Draw the largest circle in a square with a side length of 4 cm. What percentage of the circumference of the circle is the circumference of the square?
在边长4cm的正方形里画一个最大的圆，圆的周长占正方形周长的百分之几？
<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">4 / 16</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">3.14 * (1/4)</gadget>
<output>0.785</output>

<result>0.785</result>