Draw the largest circle inside a square with a side length of 10 cm. What is the circumference of the circle equal to the circumference of the square?
在边长是10厘米的正方形里面画一个最大的圆，这个圆的周长是正方形周长的多少
<gadget id="calculator">4 * 10</gadget>
<output>40</output>

<gadget id="calculator">10 / 40</gadget>
<output>1/4 = around 0.25</output>

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

<result>0.785</result>