A square paper with a side length of a meter, if 400 equal and largest circles are cut on this paper, what is the utilization rate of this paper
一张边长为a米的正方形纸，如果在这张纸上剪400个相等且最大的圆，那么这张纸的利用率是多少
<gadget id="calculator">3.14 / 4</gadget>
<output>0.785</output>

<result>0.785</result>